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	Ultra Mass	PWB8000W	NO	YES	± 38.00 mg	$2,029.00
30 kg	Class 1	PWB8100W	NO	YES	± 75.00 mg	$1,712.00
25 kg	Ultra Mass	PWB8002W	NO	YES	± 31.00 mg	$1,615.00
25 kg	Class 1	PWB8102W	NO	YES	± 62.00 mg	$1,368.00
20 kg	Ultra Mass	PWB8006W	NO	YES	± 25.00 mg	$1,342.00
20 kg	Class 1	PWB8106W	NO	YES	± 50.00 mg	$1,154.00
10 kg	Ultra Mass	PWB8010W	NO	YES	± 13.00 mg	$968.00
10 kg	Class 1	PWB8110W	NO	YES	± 25.00 mg	$812.00
5 kg	Ultra Mass	PWB8016W	NO	YES	± 6.00 mg	$462.00
5 kg	Class 1	PWB8116W	NO	YES	± 12.00 mg	$426.00
4 kg	Ultra Mass	PWB8020W	NO	YES	± 6.00 mg	$445.00
4 kg	Class 1	PWB8120W	NO	YES	± 12.00 mg	$393.00
3 kg	Ultra Mass	PWB8022W	NO	YES	± 3.80 mg	$384.00
3 kg	Class 1	PWB8122W	NO	YES	± 7.50 mg	$331.00
2 kg	Ultra Mass	PWB8024W	NO	YES	±2.50 mg	$288.00
2 kg	Class 1	PWB8124W	NO	YES	±5.00 mg	$266.00
1000 g	Ultra Mass	PWB8028W	NO	YES	±0.600 mg	$234.00
1000 g	Class 1	PWB8128W	NO	YES	±1.2 mg	$214.00
500 g	Ultra Mass	PWB8032W	NO	YES	±0.600 mg	$218.00
500 g	Class 1	PWB8132W	NO	YES	±1.20 mg	$205.00
300 g	Ultra Mass	PWB8036W	NO	YES	±0.38 mg	$200.00
300 g	Class 1	PWB8136W	NO	YES	±.75 mg	$184.00
200 g	Ultra Mass	PWB8038W	NO	YES	±0.250 mg	$183.00
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	Ultra Mass	PWB7017-0W	NO	YES	±0.125 mg	$150.00
100 g	Class 1	PWB7017-1W	NO	YES	±0.250 mg	$128.00
50 g	Ultra Mass	PWB7018-0W	NO	YES	±0.060 mg	$136.00
50 g	Class 1	PWB7018-1W	NO	YES	±0.120 mg	$115.00
30 g	Ultra Mass	PWB7019-0W	NO	YES	±0.037 mg	$136.00
30 g	Class 1	PWB7019-1W	NO	YES	±0.074 mg	$113.00
20 g	Ultra Mass	PWB7020-0W	NO	YES	±0.037 mg	$126.00
20 g	Class 1	PWB7020-1W	NO	YES	±0.074 mg	$113.00
10 g	Ultra Mass	PWB7021-0W	NO	YES	±0.025 mg	$119.00
10 g	Class 1	PWB7021-1W	NO	YES	±0.050 mg	$112.00
5 g	Ultra Mass	PWB7022-0W	NO	YES	±0.017 mg	$119.00
5 g	Class 1	PWB7022-1W	NO	YES	±0.034 mg	$103.00
2 g	Ultra Mass	PWB7024-0W	NO	YES	±0.017 mg	$119.00
2 g	Class 1	PWB7024-1W	NO	YES	±0.034 mg	$102.00
1 g	Ultra Mass	PWB7025-0W	NO	YES	±0.017 mg	$119.00
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	Ultra Mass	PWB7026-0W	NO	YES	±0.005 mg	$110.00
500 mg	Class 1	PWB7026-1W	NO	YES	±0.010 mg	$ 98.00
200 mg	Ultra Mass	PWB7028-0W	NO	YES	±0.005 mg	$110.00
200 mg	Class 1	PWB7028-1W	NO	YES	±0.010 mg	$ 98.00
100 mg	Ultra Mass	PWB7029-0W	NO	YES	±0.005 mg	$110.00
100 mg	Class 1	PWB7029-1W	NO	YES	±0.010 mg	$ 98.00
50 mg	Ultra Mass	PWB7030-0W	NO	YES	±0.005 mg	$110.00
50 mg	Class 1	PWB7030-1W	NO	YES	±0.010 mg	$ 98.00
20 mg	Ultra Mass	PWB7032-0W	NO	YES	±0.005 mg	$110.00
20 mg	Class 1	PWB7032-1W	NO	YES	±0.010 mg	$ 98.00
10 mg	Ultra Mass	PWB7033-0W	NO	YES	±0.005 mg	$110.00
10 mg	Class 1	PWB7033-1W	NO	YES	±0.010 mg	$ 98.00
5 mg	Ultra Mass	PWB7034-0W	NO	YES	±0.005 mg	$110.00
5 mg	Class 1	PWB7034-1W	NO	YES	±0.010 mg	$ 98.00
2 mg	Ultra Mass	PWB7036-0W	NO	YES	±0.005 mg	$110.00
2 mg	Class 1	PWB7036-1W	NO	YES	±0.010 mg	$ 98.00
1 mg	Ultra Mass	PWB7037-0W	NO	YES	±0.005 mg	$110.00
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)

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	Ultra Mass	PWB8000T	YES	NO	± 38.00 mg	$1,808.00
30 kg	Class 1	PWB8100T	YES	NO	± 75.00 mg	$1,615.00
25 kg	Ultra Mass	PWB8002T	YES	NO	± 31.00 mg	$1,518.00
25 kg	Class 1	PWB8102T	YES	NO	± 62.00 mg	$1,321.00
20 kg	Ultra Mass	PWB8006T	YES	NO	± 25.00 mg	$1,244.00
20 kg	Class 1	PWB8106T	YES	NO	± 50.00 mg	$1,121.00
10 kg	Ultra Mass	PWB8010T	YES	NO	± 13.00 mg	$868.00
10 kg	Class 1	PWB8110T	YES	NO	± 25.00 mg	$772.00
5 kg	Ultra Mass	PWB8016T	YES	NO	± 6.00 mg	$420.00
5 kg	Class 1	PWB8116T	YES	NO	± 12 mg	$362.00
4 kg	Ultra Mass	PWB8020T	YES	NO	± 6.00 mg	$378.00
4 kg	Class 1	PWB8120T	YES	NO	± 12 mg	$338.00
3 kg	Ultra Mass	PWB8022T	YES	NO	± 3.80 mg	$310.00
3 kg	Class 1	PWB8122T	YES	NO	± 7.5 mg	$299.00
2 kg	Ultra Mass	PWB8024T	YES	NO	±2.5 mg	$235.00
2 kg	Class 1	PWB8124T	YES	NO	±5.0 mg	$213.00
1000 g	Ultra Mass	PWB8028T	YES	NO	±0.600 mg	$185.00
1000 g	Class 1	PWB8128T	YES	NO	±1.2 mg	$168.00
500 g	Ultra Mass	PWB8032T	YES	NO	±0.600 mg	$167.00
500 g	Class 1	PWB8132T	YES	NO	±1.2 mg	$146.00
300 g	Ultra Mass	PWB8036T	YES	NO	±0.38 mg	$144.00
300 g	Class 1	PWB8136T	YES	NO	±.75 mg	$129.00
200 g	Ultra Mass	PWB8038T	YES	NO	±0.250 mg	$135.00
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	Ultra Mass	PWB7017-0T	YES	NO	±0.125 mg	$102.00
100 g	Class 1	PWB7017-1T	YES	NO	±0.250 mg	$101.00
50 g	Ultra Mass	PWB7018-0T	YES	NO	±0.060 mg	$99.00
50 g	Class 1	PWB7018-1T	YES	NO	±0.120 mg	$93.00
30 g	Ultra Mass	PWB7019-0T	YES	NO	±0.037 mg	$98.00
30 g	Class 1	PWB7019-1T	YES	NO	±0.074 mg	$93.00
20 g	Ultra Mass	PWB7020-0T	YES	NO	±0.037 mg	$81.00
20 g	Class 1	PWB7020-1T	YES	NO	±0.074 mg	$75.00
10 g	Ultra Mass	PWB7021-0T	YES	NO	±0.025 mg	$81.00
10 g	Class 1	PWB7021-1T	YES	NO	±0.050 mg	$75.00
5 g	Ultra Mass	PWB7022-0T	YES	NO	±0.017 mg	$74.00
5 g	Class 1	PWB7022-1T	YES	NO	±0.034 mg	$72.00
2 g	Ultra Mass	PWB7024-0T	YES	NO	±0.017 mg	$74.00
2 g	Class 1	PWB7024-1T	YES	NO	±0.034 mg	$72.00
1 g	Ultra Mass	PWB7025-0T	YES	NO	±0.017 mg	$74.00
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	Ultra Mass	PWB7026-0T	YES	NO	±0.005 mg	$74.00
500 mg	Class 1	PWB7026-1T	YES	NO	±0.010 mg	$72.00
200 mg	Ultra Mass	PWB7028-0T	YES	NO	±0.005 mg	$74.00
200 mg	Class 1	PWB7028-1T	YES	NO	±0.010 mg	$72.00
100 mg	Ultra Mass	PWB7029-0T	YES	NO	±0.005 mg	$74.00
100 mg	Class 1	PWB7029-1T	YES	NO	±0.010 mg	$72.00
50 mg	Ultra Mass	PWB7030-0T	YES	NO	±0.005 mg	$74.00
50 mg	Class 1	PWB7030-1T	YES	NO	±0.010 mg	$72.00
20 mg	Ultra Mass	PWB7032-0T	YES	NO	±0.005 mg	$74.00
20 mg	Class 1	PWB7032-1T	YES	NO	±0.010 mg	$72.00
10 mg	Ultra Mass	PWB7033-0T	YES	NO	±0.005 mg	$74.00
10 mg	Class 1	PWB7033-1T	YES	NO	±0.010 mg	$72.00
5 mg	Ultra Mass	PWB7034-0T	YES	NO	±0.005 mg	$74.00
5 mg	Class 1	PWB7034-1T	YES	NO	±0.010 mg	$72.00
2 mg	Ultra Mass	PWB7036-0T	YES	NO	±0.005 mg	$74.00
2 mg	Class 1	PWB7036-1T	YES	NO	±0.010 mg	$72.00
1 mg	Ultra Mass	PWB7037-0T	YES	NO	±0.005 mg	$74.00
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.

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.

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.

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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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