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ASTM-E4, ISO 7500-1

Standard Practices for Force Verification of Testing Machines. Testing Machines may be verified by use of weights, use of equal-arm balances and standard weight or use of elastic calibration devices. It is recommended that testing machines be verified annually or more frequently if required. In no case shall the interval between verifications exceed 18 months.

United's Load Cells are designed to precisely measure the amount of force (load) applied to the specimen being tested. Available in single or dual bridge, United load cells offer the flexibility of using two readouts simultaneously, if desired. Constructed to meet ASTM E-4 requirements.