All quality documentation is continually updated and can be found at External link opens in new tab or window

Scale-Tech, ltd will perform the following services under our standard service inspection agreement:

  • The exterior of all units will be cleaned and visually inspected.
  • All test standards are traceable to the national standard. ( N.I.S.T. )
  • An ISO 17025 calibration report will be issued for each unit, with as found and as left condition.
  • Qualified trained technicians will perform all work.
  • Verification that calibration certificates are evaluated for compliance with ISO/IEC: 17025 and A2LA requirements.

All calibration procedures have been implemented and designed by Scale-Tech, ltd. and follows the guidelines and tolerances set forth by NIST Handbook 44 (HB44).

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The tolerances for pass or fail are set in HB44 and are the applicable tolerances we follow by default. We do accept customer’s specified tolerances and apply them to pass or fail if the weighing equipment is not used in a legal for trade application. The applicable tolerance is listed as a classification on test report ETR1007.

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Our A2lA qualifications are standard to ISO 17025:2017 when required by our customer. It is simply a certification that makes sure we comply with the guide and that we are following our own quality manual. (available upon request).

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The electronic report we submit can be a useful guide in determining the accuracy of your weighing equipment. It has been adapted to serve our customer requirements into one report and to avoid confusion. The biggest thing to pay attention to is error and tolerance. It describes, in detail the as found (prior to adjustments or repairs) and as left condition (after adjustments or repairs) of your weighing equipment. There is an indication of load (what is on the scale) and applied (what is added to scale) and the reading. The error of the reading representing the difference between actual and what was represented by the scale indication. A percentage representation of the error. The tolerance (typically HB44) is listed in the tolerance column. Any error greater than the tolerance will result in a failure of test 1. The UNC column is a stated uncertainty of the results based on our scope CMC (calibration and measurement capability uncertainty) value plus (1) scale division.

The shift test is a requirement by HB44. The recommended applied load and loading pattern on the corners are described in HB44. Increasing load is also a requirement in HB44 and documents results of weight increased from zero load to a specified percentage of capacity described in HB44. Decreasing load is a HB44 requirement. These readings result from max test load and return to zero.

The pass percentage, located at top right of report, is accurate result of overall passing of test 1. This includes every test on that piece of equipment. 100% meaning it has never failed test 1. This is not a reflection of the current test that has been performed. This is a very important piece of data in determining accuracy between calibration cycles or equipment failure due to age, misuse or change in environmental conditions. In most cases, increasing the calibration frequency can improve this number. The customer’s confidence in the equipment between calibration cycles can be directly reflected in this number. The equipment in question should be evaluated and may need parts replaced or the unit itself may need replaced. Our technical staff will always bring any equipment or calibration issue to the customer contact. Weighing equipment cannot hold calibration forever, customers will be notified when  weighing equipment Pass Percentage drops below 30%.

Test #2 will be performed only after a failure of Test #1, otherwise, left blank. Only one adjustment attempt will be performed. A failure of Test #2, removes unit for repair and will be tested after repairs are made.

Test #1 Results

Sealed / Calibrated / Passed

                Unit passed test one and was within all applicable tolerances.

Not Sealed / Calibrated / Passed

                Unit did not pass test one and will require calibration adjustment.

No Adjustments Made

Unit required no adjustments. Although a scale can pass test one, and technician will adjust calibration as close to practical zero error.

Remove Unit From Calibration List

                Customer does not want this unit tested any longer and will be removed from calibration cycle.

Test #2 Results

Sealed / Calibrated / Passed

                Unit passed test two after adjustments or repairs and was within all applicable tolerances.

Not Sealed / Calibrated / Passed

                Unit did not pass test two and will require repairs to put unit back into service.

Remove For Repairs

Unit will need to be removed for repairs and should not be used for weighing. Unit will also receive a NOT CALIBRATED sticker.

Our field standards are linked by an unbreakable chain to the national standard (NIST) and are certified bi-annually. This is documented on our test report at the bottom and is a linkable field to our certificates.

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Please feel free to browse our website at External link opens in new tab or window for any information you may need or please contact me at your convenience. Scale-Tech is focused on providing our customer with optimum weighing equipment sales, service and calibration results and solutions possible.