McLean Scale   Co. Ltd.  since 1974

ISO9001 * Measurement Canada Accredited


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Calibration Test Weights / Standards 


Cast Iron, NIST, ASTM, and OIML ClassificationStainless Steel, NIST ClassificationElectronic Calibration Weights, ASTM ClassificationPrecision Laboratory Weights, ASTM ClassificationPrecision Laboratory, OIML ClassificationHook WeightsAccessories

complete line of test standards, kits, individual weights and accessories

traceable certificates of calibration

NIST, OIML and ASTM class weights


Calibration / Test Weights


ASTM Class 1

ASTM Class 2

ASTM Class 3

NIST Class F

NIST Class F


s/s screw knob

s/s screw knob

s/s screw knob

s/s cylindrical

cast iron grip handle

Scale Display Interval

.01 / 0.1 mg

.001 / .01 g

.01 / .1 g

.1 / 1g

1g and above

Options :

- cases for individual ASTM weights available

- other weight values and kits available , please inquire

- Calibration Certificate : per certificate (no limit in the number of weights per cert)

- factory applied serial number or unique marking 

                             Weight Classes for Balance Calibration


ASTM Class 1 - Recommended for balances that are as accurate as 0.01 and 0.1mg.


ASTM Class 2 - Recommended for analytical balances with accuracies of 0.001 to 0.01 g


ASTM Class 3 - Recommended for semi-analytical balances with accuracies from 0.01 - 0.1 g


NIST Class F suitable for use will class III  legal for trade scales, commercial, industrial and heavy capacity weigh scales


- taxes extra as applicable



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Contact Us :                                                                      

Sales and Administration : Scott McLean                               

Service and Technical Support :

Phone : 519-652-9235

Fax : 519-652-0940

McLean Scale Co. Ltd.
3392 Wonderland Rd. S.
London, Ontario
N6L 1A8