Calibration for analytical balances, industrial scales, precision electronic toploading scales

SELECTABLE CALIBRATION FEATURE

Calibration is a very important to the accuracy of any balance. Just as a musician must have one true tone to tune his instrument, a balance needs a true weight to tune itself. Calibration is done by giving a base point (ZERO) and establishing what is the full capacity (SPAN) weight. Since SPAN is normally the balance's maximum capacity, the balance now has two precise extreme points: zero and full scale. The balance can now accurately calculate all amounts in between the base point (ZERO) and full capacity (SPAN.)

A&D balances offer a selectable calibration feature for those people wishing not to calibrate the balance at the full designed weighing capacity. Calibrating a balance closer to the user's actual maximum weighing capacity will offer a more accurate calibration. For example, an individual may purchase the A&D EK-6000i which offers the ability to weigh up to 6000g with 0.1g readability. Instead the user only plans on weighing up to 4800 grams. The EK-6000i offers the ability to calibrate the scale at 4 programmed capacities - 3000g, 4000g, 5000g or 6000g. Therefore, to improve even greater accurate the user would calibrate the EK-6000i with a 5000 gram calibration mass.

Balances are influenced by changes in seasonal temperature, humidity, barometric pressure and the gravitational acceleration (the position of your location related to magnetic north) for the location at which the precision weighing instrument is being used. It is necessary to calibrate the balance when it is being installed for the first time and after any changes of locations. It is also recommended that a balance be calibrated regularly in order to obtain the most precision. Most GLP/GMP and Quality Assurance Directives for a ISO manufacturing environment require in their procedure a daily calibration. Also, in critical weighing applications such as formulation of inks, paints and adhesive a daily calibration is a must.

Precision Weighing Balances highly recommends you consider purchasing the calibration mass at the same time you place your order for your balance. It will only be a matter of time before you are calling for the calibration mass to be delivered "yesterday". The calibration mass will also enable you to perform all calibrations within your organization and eliminate in most situations the additional expense of calling a calibration service company in.

A&D designed the GF, GR, HR, GX, HF, HFG, HP, EKi - Series with the user in mind making full digital calibration a cinch. You can also change the calibration mass value for calibrating your A&D balance to several programmed mass values to meet your weighing needs. To enter the calibration mass value use the following steps:

Press and hold the "RE-ZERO" key to enter the calibration mode.
Release the "RE-ZERO" key when the balance displays either "CAL or CAL 0".
Press the "MODE" key to change the calibration mass value
Enter the calibration mass value using the following keys: "MODE" key is used to move digit to enter a number; "RE-ZERO" key is used to change a number. Verify that there is nothing on the weighing pan.
Press the "RE-ZERO" key. The balance measures the zero-point.

Learn more about calibration an installation issues that
may effect the performance of your balance.

Certified Calibration Weights from Sartorius

1 mg to 5 kg weights. Sold individually or as a 9-piece or 21-piece set.
All weights meet or exceed ASTM specifications
All mass measurements are made using procedures developed by NIST
All mass standards are milled from the finest corrosion-resistant stainless steel stock ensuring consistent density
Each weight is calibrated by a NVLAP-accredited metrology lab in a climate-controlled environment
One-piece construction provides the maximum mass stability
Each weight and weight set is supplied complete with a Certificate of Traceability
Certificate of Calibration

(7-10 days lead time for all calibration weights and mass sets)

Metric Weight Tolerances - all tolerances stated in milligram (mg) Calibration Weights Includes Certificate of Calibration
Nominal Value	Class	Part Number	Report of Traceability	NVLAP Certification	Tolerance	Price
Cylindrical OIML Shape
30 kg	Class 1	PWB8100W	NO	YES	± 75.00 mg	$1,712.00
25 kg	Class 1	PWB8102W	NO	YES	± 62.00 mg	$1,368.00
20 kg	Class 1	PWB8106W	NO	YES	± 50.00 mg	$1,154.00
10 kg	Class 1	PWB8110W	NO	YES	± 25.00 mg	$812.00
5 kg	Class 1	PWB8116W	NO	YES	± 12.00 mg	$426.00
4 kg	Class 1	PWB8120W	NO	YES	± 12.00 mg	$393.00
3 kg	Class 1	PWB8122W	NO	YES	± 7.50 mg	$331.00
2 kg	Class 1	PWB8124W	NO	YES	±5.00 mg	$266.00
1000 g	Class 1	PWB8128W	NO	YES	±1.2 mg	$214.00
500 g	Class 1	PWB8132W	NO	YES	±1.20 mg	$205.00
300 g	Class 1	PWB8136W	NO	YES	±.75 mg	$184.00
200 g	Class 1	PWB8138W	NO	YES	±0.50 mg	$171.00
(7-10 days lead time for all calibration weights and mass sets)
Nominal Value	Class	Part Number	Report of Traceability	NVLAP Certification	Tolerance	Price
Small Knob Style, ASTM Shape
100 g	Class 1	PWB7017-1W	NO	YES	±0.250 mg	$128.00
50 g	Class 1	PWB7018-1W	NO	YES	±0.120 mg	$115.00
30 g	Class 1	PWB7019-1W	NO	YES	±0.074 mg	$113.00
20 g	Class 1	PWB7020-1W	NO	YES	±0.074 mg	$113.00
10 g	Class 1	PWB7021-1W	NO	YES	±0.050 mg	$112.00
5 g	Class 1	PWB7022-1W	NO	YES	±0.034 mg	$103.00
2 g	Class 1	PWB7024-1W	NO	YES	±0.034 mg	$102.00
1 g	Class 1	PWB7025-1W	NO	YES	±0.034 mg	$102.00
(7-10 days lead time for all calibration weights and mass sets)
Photo shown above for the flat weights are of OIML specification weights. The ASTM weights are actually square in their shape.

Nominal Value	Class	Part Number	Report of Traceability	NVLAP Certification	Tolerance	Price
Flat Weights, ASTM Shape
500 mg	Class 1	PWB7026-1W	NO	YES	±0.010 mg	$ 98.00
200 mg	Class 1	PWB7028-1W	NO	YES	±0.010 mg	$ 98.00
100 mg	Class 1	PWB7029-1W	NO	YES	±0.010 mg	$ 98.00
50 mg	Class 1	PWB7030-1W	NO	YES	±0.010 mg	$ 98.00
20 mg	Class 1	PWB7032-1W	NO	YES	±0.010 mg	$ 98.00
10 mg	Class 1	PWB7033-1W	NO	YES	±0.010 mg	$ 98.00
5 mg	Class 1	PWB7034-1W	NO	YES	±0.010 mg	$ 98.00
2 mg	Class 1	PWB7036-1W	NO	YES	±0.010 mg	$ 98.00
1 mg	Class 1	PWB7037-1W	NO	YES	±0.010 mg	$ 98.00
The weight value can deviate above or below the nominal value by the tolerance defined. To determine the tolerance of a mass, look at the denomination or nominal value of the weight and the appropriate class you need.
Custom weight sets are available upon request by calling Precision Weighing Balances at 978-521-7095
All calibration weights are not returnable. Once your order has been placed it CAN NOT be cancelled. Please carefully consider this prior to placing your order. The reason for this is these weights are custom manufactured and are certified on the date they were made. In addition, if you touch the calibration weight with your fingers the oil in your skin would change the tolerance and we can not take this chance if the weight was returned.

(7-10 days lead time for all calibration weights and mass sets)

Certificate of Calibration
The Certificate of Calibration report includes the nominal value and the conventional mass correction value for each weight certified. It will also list information on the standards the weights were compared against including:

Uncertainty value
Identifying number
NIST test number
Date the standards were last calibrated
NVLAP laboratory code

Recertification Service
Weight values can change over time due to scratches, fingerprints, wear and even corrosion resulting from atmospheric contaminants. Regular checks on the accuracy of mass standards ensures the accuracy of measurements. The Sartorius mass metrology lab provides this service at a very competitive price.

The current rates are listed below and subject to change. Typical turn around time (excludes transit time) is 7-10 business days upon receipt at the Arvada, Colorado metrology lab. You are responsible for both in and out bound freight and insurance costs.

Single weights - $65
Two or more weights - $48 each
Weight sets of 15 or more weights - $37 each

Please call us at 978-521-7095 if you presently have calibrations weights that require recertification.

What does calibration of a laboratory weight entail?

Sartorius mass comparators compare a weight to a known mass (a NIST calibrated reference weight) and report the difference, to a very small value. These mass comparators can ascertain and measure differences to 10, 1, and even 0.1 micrograms (one ten-millionth of a gram), multiple weighings, averaged, can resolve the differences to even smaller amounts.

Calibration technicians must wear appropriate static free clothing, as well as gloves, hair nets and face masks, to reduce the possibility of contamination (and changing the weight of the weights) from skin oils, hairs, or airborne droplets. Calibration weights are never touched directly by human hands.

What is the difference in tolerance between Sartorius Ultra Class U, Class 1, Class 2 and other calibration specifications?

Metric Weight Tolerances - all tolerances stated in milligram (mg)

American Society of Testing & Measurement ASTM E617

Denomi-
nation
Metric Sartorius
Ultra
Class U Class 1
mg Class 2
mg Class 3
mg Class 4
mg Class 5
mg Class 6
mg Class 7
mg

5 kg 6.00 12 25 50 100 250 500 1400

3 kg 3.80 7.5 15 30 60 150 300 1000

2 kg 2.50 5.0 10 20 40 100 200 750

1 kg 1.25 2.5 5.0 10 20 50 100 470

500 g 0.600 1.2 2.5 5.0 10 30 50 300

300 g 0.380 0.75 1.5 3.0 6.0 20 30 210

200 g 0.250 0.50 1.0 2.0 4.0 15 20 160

100 g 0.125 0.25 0.50 1.0 2.0 9 10 100

50 g 0.060 0.12 0.25 0.60 1.2 5.6 7

30 g 0.037 0.074 0.15 0.45 0.90 4.0 5 44

20 g 0.037 0.074 0.10 0.35 0.70 3.0 3 33

10 g 0025 0.050 0.074 0.25 0.50 2.0 2 21

5 g 0.017 0.034 0.054 0.18 0.36 1.3 2 13

3g 0.017 0.034 0.054 0.15 0.30 0.95 2 9.4

2 g 0.017 0.034 0.054 0.13 0.26 0.75 2 7.0

1 g 0.017 0.034 0.054 0.10 0.20 0.50 2 4.5

500 mg 0.005 0.010 0.025 0.080 0.16 0.38 1 3.0

200 mg 0.005 0.010 0.025 0.060 0.12 0.26 1 1.8

100 mg 0.005 0.010 0.025 0.050 0.10 0.20 1 1.2

50 mg 0.005 0.010 0.014 0.042 0.085 0.16 0.5 0.88

20 mg 0.005 0.010 0.014 0.035 0.070 0.12 0.5 0.56

10 mg 0.005 0.010 0.014 0.030 0.060 0.10 0.5 0.4

5 mg 0.005 0.010 0.014 0.028 0.055 0.080 0.2

2 mg 0.005 0.010 0.014 0.025 0.050 0.060 0.2

1 mg 0.005 0.010 0.014 0.025 0.050 0.050 0.1

The table above is a listing of the tolerances of various classes of masses. The weight value can deviate above or below the nominal value by the tolerance defined. To determine the tolerance of a mass, look at the denomination or nominal value of the weight and the appropriate class you need.

Custom weight sets are available upon request by calling
Precision Weighing Balances at 978-521-7095

All calibration weights are not returnable. Once your order has been placed it CAN NOT be cancelled. Please carefully consider this prior to placing your order. The reason for this is these weights are custom manufactured and are certified on the date they were made. In addition, if you touch the calibration weight with your fingers the oil in your skin would change the tolerance and we can not take this chance if the weight was returned.



Metric Weight Tolerances - all tolerances stated in milligram (mg) Statement Of Accuracy included Note Traceable or NVLAP calibration certificate available AT ADDITIONAL COST
Nominal Value	Class	Part Number	Certification	Tolerance	Price
30 kg	Class 2	TR8200	Optional - click here	± 150.00 mg	$1,400.00
25 kg	Class 2	TR8202	Optional - click here	± 125.00 mg	$1,168.00
20 kg	Class 2	TR8206	Optional - click here	± 100.00 mg	$1,014.00
10 kg	Class 2	TR8210	Optional - click here	± 50.00 mg	$665.00
5 kg	Class 2	TR8216	Optional - click here	± 25 mg	$286.00
4 kg	Class 2	TR8220	Optional - click here	± 25 mg	$293.00
3 kg	Class 2	TR8222	Optional - click here	± 15 mg	$226.00
2 kg	Class 2	TR8224	Optional - click here	± 10.0 mg	$141.00
1000 g	Class 2	TR8228	Optional - click here	± 5 mg	$113.00
500 g	Class 2	TR8232	Optional - click here	±2.5 mg	$93.00
400 g	Class 2	TR8234	Optional - click here	±2.5 mg	$100.00
300 g	Class 2	TR8236	Optional - click here	±1.5 mg	$77.00
200 g	Class 2	TR8238	Optional - click here	±1.0 mg	$71.00
100 g	Class 2	TR8244	Optional - click here	±0.5 mg	$60.00
50 g	Class 2	TR8252	Optional - click here	±0.25 mg	$55.00
20 g	Class 2	TR8256	Optional - click here	±0.1 mg	$55.00
10 g	Class 2	TR8258	Optional - click here	±0.074 mg	$58.00
(7-10 days lead time for all calibration weights and mass sets)

Quality Guaranteed by the Toughest Standards of All… Our Own.

Designed for scale calibration, our solid cast iron test weights are sealed to ASTM classes 6 and 7 specifications; Class F tolerances are listed in the National Institute of Standards and Technology Handbook 105-1. All weights are traceable to NIST. To verify adherence to class F tolerances, OPTIONAL traceable certificates are available for an additonal $75.00.

Our cast iron weights undergo a special phosphatizing process in which the metal is thoroughly cleaned and mildly etched to allow exceptional finish adhesion. The weights are then coated with a layer of chip-resistant paint which conforms to NIST Handbook 105-1 standards. This two-step process ensures a long-lasting finish that greatly reduces the possibility of corrosion.

Complete Listing of all Available Cast Iron Grip Handle Weights WITHOUT traceability certificate
Nominal Value	Class	Tolerance	Part Number	Weight Dimensions	Price
1lb	Class 7	± 210 mg	12876	1.63" x 2.63" x 1.25"	$50.00
2 lb	Class 7	± 300 mg	12874	2.06" x 3.13" x 1.63	$60.00
5 lb	Class 7	± 750 mg	12823	2.63" x 4" x 3"	$65.00
10 lb	Class 7	± 1 g	12828	3.25" x 5" x 3.88"	$84.50
20 lb	Class F	± 1 g	12870	5.87" x 4.5" x 5"	$109.90
25 lb	Class F	± 1.1 g	12833	4.38" x 6.63" x 4.93"	$133.90
50 lb	Class F	± 2.3 g	12839	5.63" x 7.88" x 6.38"	$146.90
5 kg	Class 7	± 1.4 g	12786	3.25" x 5.38" x 4"	$80.00
10 kg	Class F	± 2.2 g	12767	4.5" x 6" x 4.94"	$100.00
20 kg	Class F	± 2.0 g	12771	7.75" x 5.63" x 5.88"	$128.70
25 kg	Class F	± 2.5 g	12775	5.38" x 8" x 7"	$170.00
All calibration weights are not returnable. Once your order has been placed it CAN NOT be cancelled. Please carefully consider this prior to placing your order. The reason for this is these weights are custom manufactured and are certified on the date they were made. In addition, if you touch the calibration weight with your fingers the oil in your skin would change the tolerance and we can not take this chance if the weight was returned.


Calibration weights - all tolerances stated in milligram (mg) Statement Of Accuracy included Note Traceable or NVLAP calibration certificate available AT ADDITIONAL COST
Nominal Value	Class	Part Number	Certification	Tolerance	Price
50 lb grip	Class F	TR1276	Optional - click here	± 2.3 g	$727.00
30 lb grip	Class F	TR1275	Optional - click here	± 1.4 g	$570.00
25 lb grip	Class F	TR1274	Optional - click here	± 1.1 g	$483.00
20 lb grip	Class F	TR1272	Optional - click here	± 910 mg	$437.00
10 lb grip	Class F	TR1270	Optional - click here	± 450 mg	$266.00
10 lb	Class F	TR1201	Optional - click here	± 450 mg	$173.00
5 lb	Class F	TR1203	Optional - click here	± 230 mg	$112.00
2 lb	Class F	TR1209	Optional - click here	± 91.0 mg	$69.00
1 lb	Class F	TR1211	Optional - click here	± 70.0 mg	$50.00
12 oz	Class F	TR1212	Optional - click here	±70.0 mg	$42.00
8 oz	Class F	TR1213	Optional - click here	±45.0 mg	$40.00
4 oz	Class F	TR1215	Optional - click here	±23.0 mg	$35.00
2 oz	Class F	TR1217	Optional - click here	±11.0 mg	$32.00
1 oz	Class F	TR1220	Optional - click here	±5.4 mg	$30.00
1/2 oz	Class F	TR1222	Optional - click here	±2.8 mg	$29.00
1/4 oz	Class F	TR1224	Optional - click here	±1.7 mg	$22.00
1/8 oz	Class F	TR1226	Optional - click here	±1.3 mg	$22.00
1/16 oz	Class F	TR1228	Optional - click here	±1.1 mg	$23.00
(7-10 days lead time for all calibration weights and mass sets)

Metric Weight Tolerances - all tolerances stated in milligram (mg) Calibration Weights Includes Report of Traceability
Nominal Value	Class	Part Number	Report of Traceability	NVLAP Certification	Tolerance	Price
Cylindrical OIML Shape
30 kg	Class 1	PWB8100T	YES	NO	± 75.00 mg	$1,615.00
25 kg	Class 1	PWB8102T	YES	NO	± 62.00 mg	$1,321.00
20 kg	Class 1	PWB8106T	YES	NO	± 50.00 mg	$1,121.00
10 kg	Class 1	PWB8110T	YES	NO	± 25.00 mg	$772.00
5 kg	Class 1	PWB8116T	YES	NO	± 12 mg	$362.00
4 kg	Class 1	PWB8120T	YES	NO	± 12 mg	$338.00
3 kg	Class 1	PWB8122T	YES	NO	± 7.5 mg	$299.00
2 kg	Class 1	PWB8124T	YES	NO	±5.0 mg	$213.00
1000 g	Class 1	PWB8128T	YES	NO	±1.2 mg	$168.00
500 g	Class 1	PWB8132T	YES	NO	±1.2 mg	$146.00
300 g	Class 1	PWB8136T	YES	NO	±.75 mg	$129.00
200 g	Class 1	PWB8138T	YES	NO	±0.50 mg	$126.00
(7-10 days lead time for all calibration weights and mass sets)
Nominal Value	Class	Part Number	Report of Traceability	NVLAP Certification	Tolerance	Price
Small Knob Style, ASTM Shape
100 g	Class 1	PWB7017-1T	YES	NO	±0.250 mg	$101.00
50 g	Class 1	PWB7018-1T	YES	NO	±0.120 mg	$93.00
30 g	Class 1	PWB7019-1T	YES	NO	±0.074 mg	$93.00
20 g	Class 1	PWB7020-1T	YES	NO	±0.074 mg	$75.00
10 g	Class 1	PWB7021-1T	YES	NO	±0.050 mg	$75.00
5 g	Class 1	PWB7022-1T	YES	NO	±0.034 mg	$72.00
2 g	Class 1	PWB7024-1T	YES	NO	±0.034 mg	$72.00
1 g	Class 1	PWB7025-1T	YES	NO	±0.034 mg	$72.00
(7-10 days lead time for all calibration weights and mass sets)
Photo shown above for the flat weights are of OIML specification weights. The ASTM weights are actually square in their shape.

Nominal Value	Class	Part Number	Report of Traceability	NVLAP Certification	Tolerance	Price
Flat Weights, ASTM Shape
500 mg	Class 1	PWB7026-1T	YES	NO	±0.010 mg	$72.00
200 mg	Class 1	PWB7028-1T	YES	NO	±0.010 mg	$72.00
100 mg	Class 1	PWB7029-1T	YES	NO	±0.010 mg	$72.00
50 mg	Class 1	PWB7030-1T	YES	NO	±0.010 mg	$72.00
20 mg	Class 1	PWB7032-1T	YES	NO	±0.010 mg	$72.00
10 mg	Class 1	PWB7033-1T	YES	NO	±0.010 mg	$72.00
5 mg	Class 1	PWB7034-1T	YES	NO	±0.010 mg	$72.00
2 mg	Class 1	PWB7036-1T	YES	NO	±0.010 mg	$72.00
1 mg	Class 1	PWB7037-1T	YES	NO	±0.010 mg	$72.00
The weight value can deviate above or below the nominal value by the tolerance defined. To determine the tolerance of a mass, look at the denomination or nominal value of the weight and the appropriate class you need.
Custom weight sets are available upon request by calling Precision Weighing Balances at 978-521-7095
All calibration weights are not returnable. Once your order has been placed it CAN NOT be cancelled. Please carefully consider this prior to placing your order. The reason for this is these weights are custom manufactured and are certified on the date they were made. In addition, if you touch the calibration weight with your fingers the oil in your skin would change the tolerance and we can not take this chance if the weight was returned.

Calibration Cal-Pak Weight Sets
(2-3 weeks lead time for all Class 1 Cal-Pak weights and mass sets
and 4-5 weeks lead time for all Class 0 Cal-Pak sets.)

3-piece Cal-Pak Weight Sets with NVLAP Cert
Weights	Class	NVLAP Certificate	Price
2g, 200mg, 1mg	Class 0	YES	$273.00
5g, 500mg, 1mg	Class 0	YES	$294.00
20g, 2g, 20mg	Class 1	YES	$252.00
20g, 2g, 200mg	Class 1	YES	$273.00
50g, 5g, 200mg	Class 1	YES	$252.00
50g, 5g, 2g	Class 1	YES	$273.00
100g, 10g, 20mg	Class 1	YES	$304.00
100g, 10g, 200mg	Class 1	YES	$304.00
100g, 10g, 2g	Class 1	YES	$319.00
200g, 20g, 200mg	Class 1	YES	$273.00
200g, 20g, 2g	Class 1	YES	$335.00
500g, 50g, 20mg	Class 1	YES	$425.00
500g, 50g, 200mg	Class 1	YES	$425.00
500g, 50g, 2g	Class 1	YES	$438.00
1kg, 100g, 2g	Class 1	YES	$561.00
1kg, 100g, 20g	Class 1	YES	$561.00
2kg, 200g, 2g	Class 1	YES	$819.00
2kg, 200g, 20g	Class 1	YES	$819.00
5kg, 500g, 2g	Class 1	YES	$1055.00
5kg, 500g, 20g	Class 1	YES	$1050.00
Custom weight sets are available upon request by calling Precision Weighing Balances at 978-521-7095
All calibration weights are not returnable. Once your order has been placed it CAN NOT be cancelled. Please carefully consider this prior to placing your order. The reason for this is these weights are custom manufactured and are certified on the date they were made. In addition, if you touch the calibration weight with your fingers the oil in your skin would change the tolerance and we can not take this chance if the weight was returned.
(2-3 weeks lead time for all Class 1 Cal-Pak weights and mass sets and 4-5 weeks lead time for all Class 0 Cal-Pak sets. )

Other Weight Sets with NVLAP Cert
Weights	# of weights in set	Class	NVLAP Certificate	Price
30kg-1mg	32 - more info	Class 1	YES	$13895.00
25kg-1g	20 - more info	Class 1	YES	$11908.00
20kg-1mg	30 - more info	Class 1	YES	$9294.00
10kg-1g	17 - more info	Class 1	YES	$6345.00
5kg-1g	16 - more info	Class 1	YES	$4745.00
2kg-1g	15 - more info	Class 1	YES	$3928.00
2kg-1mg	27 - more info	Class 1	YES	$4711.00
2kg-1g	14 - more info	Class 1	YES	$3127.00
2kg-1mg	26 - more info	Class 1	YES	$3910.00
1kg-1g	13 - more info	Class 1	YES	$2524.00
1kg-1mg	25 - more info	Class 1	YES	$3307.00
500g-1g	12 - more info	Class 1	YES	$1884.00
500g-1mg	24 - more info	Class 1	YES	$2649.00
200g-1g	10 - more info	Class 1	YES	$1016.00
200g-1mg	22 - more info	Class 1	YES	$1899.00
100g-1g	9 - more info	Class 1	YES	$952.00
100g-1mg	21 - more info	Class 1	YES	$1785.00
50g-1mg	20 - more info	Class 1	YES	$1669.00
500mg-1mg	12 - more info	Class 1	YES	$912.00
Custom weight sets are available upon request by calling Precision Weighing Balances at 978-521-7095
All calibration weights are not returnable. Once your order has been placed it CAN NOT be cancelled. Please carefully consider this prior to placing your order. The reason for this is these weights are custom manufactured and are certified on the date they were made. In addition, if you touch the calibration weight with your fingers the oil in your skin would change the tolerance and we can not take this chance if the weight was returned.
(2-3 weeks lead time for all Class 2 calibration weights and mass sets. )

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Have Questions? Call 978-521-7095 or e-mail us your questions and we will assist you in your selection.

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