• All Denver Instrument weights meet or exceed ASTM specifications
• All mass measurements are made using procedures developed by NIST
• All mass standards are milled from the finest bar steel stock ensuring consistent density
• Each weight is calibrated 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 Conformance
• Certificate of Calibration is available at a nominal cost

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Cylinder		Flat mg Weights	Small Knob Weights
1g	150g	1mg	1g
2g	160g	2mg	2g
5g	200g	5mg	5g
10g	300g	10mg	10g
20g	400g	20mg	20g
30g	500g	50mg	50g
40g	1Kg	100mg	100g
50g	2Kg	200mg
100g	5Kg	500mg

Set		Weights Included
1mg - 100g	21 Piece Set	1mg, 2 x 2mg, 5mg, 10mg, 2 x 20mg, 50mg, 100mg, 2 x 200mg, 500mg, 1g, 2 x 2g, 5g, 10g, 2 x 20g, 50g, 100g
10mg-50g	16 Piece Set	10mg, 2 x 20mg, 50mg, 100mg, 2 x 200mg, 500mg, 1g, 2 x 2g, 5g, 10g, 2 x 20g, 50g
10mg-100g	17 Piece Set	10mg, 2 x 20mg, 50mg, 100mg, 2 x 200mg, 500mg, 1g, 2 x 2g, 5g, 10g, 2 x 20g, 50g, 100g
1g-50g	8 Piece Set	1g, 2 x 2g, 5g, 10g, 2 x 20g, 50g 1g-100g 9 Piece Set 1g, 2 x 2g, 5g, 10g, 2 x 20g, 50g, 100g
100g-1kg	5 Piece Set	100g, 2 x200g, 500g, 1000g

Which Class is Right for My Application?
A balance should be calibrated using a weight with a class tolerance factor greater than the readability of the balance. Example: A toploading balance with readability of 0.01g may be calibrated with a weight having a known tolerance of at least 0.009g.

Ulti-Mass Standards. These mass standards provide the greatest precision available from Denver Instrument. They are ideal for use as reference standards to calibrate other weights or for calibrating high-resolution analytical balances. Ulti-Mass weights are adjusted to Class 0 tolerance but meet Class 1 specification for markings and density. The Ulti-Mass weights are approximately two times the precision of ANSI/ASTM Class 1.

ANSI/ASTM Class 1. Provides high precision. Can be used as reference standards in calibrating other weights and are appropriate for calibration of high-precision analytical balances.

ANSI/ASTM Class 2. Appropriate for calibrating high-precision toploading balances with readabilities ranging from 0.001g to 0.01g.

ANSI/ASTM Classes 3 and 4. Appropriate for calibrating balances with moderate precision, ranging from 0.01g to 0.1g.

Certificate of Conformance.
Each Denver Instrument weight or weight set is supplied with a certificate of conformance at no additional cost. This report identifies the tolerance class, type of construction and lists the NIST test number and date for the applicable Denver Instrument primary standard(s), the secondary set number and the technician’s signature.

Certificate of Calibration
For a nominal fee, add a Certificate of Calibration to any Denver Instrument weight or weight set by adding a "C" to the end of the part number. 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: identifying number, NIST test number and date the standards were last calibrated.

Weight Class Tolerance Chart