Device Licensing

Current ISDA W&M License Fees and Device Code Key


KEY    (Description)




  Scales <= 50 lb



  Scales   >50 <= 1,159 lb



  Scales >1,160 <= 7,499 lb



  Scales >7,500 <= 59,999 lb


     E & F

  Scales   60,000 lb or more



  Meter <= 20 gpm



  Meter 30 < 150 gpm



  Meter >= 150 gpm



  LPG dispenser


    K & L

  LPG temperature compensated



  Cordage or Fabric meter



Natural gas motor fuel devices



  Bulk oil meter



  Meter > 20gpm <= 30gpm or fuel additive metering devices


ISDA W&M requires any weighing or measuring instrument or device used for commercial purposes in the State of Idaho to be licensed annually.   No person shall operate or use for commercial purposes within the state any weighing or measuring instrument or device that is not licensed. Idaho has also adopted Rules for National Type Evaluation. These rules also require that commercially used measuring devices be Type Approved.


Applications for device licenses are mailed to any entity that Idaho State Department of Agriculture, Bureau of Weights and Measures (ISDA W&M) has tested a device or instrument for in the past.   These applications have the number and type of devices shown for each location based on the last inspection done.   Blank applications are available from local ISDA W&M inspectors.   For new businesses, a ISDA W&M Business Identification Number will be generated by the local inspector to reference business locations when filling out blank applications.

The current annual license for instruments and devices shall be displayed in a prominent place at the same physical location where those devices are installed or used.

A commercial device is any device that is used to buy or sell or used to determine a charge.

The term commercial weighing and measuring device is defined as any weight or measure or weighing or measuring device commercially used or employed in establishing the size, quantity, extent, area or measurement of quantities, things, product, or articles for distribution or consumption, purchased, offered or submitted for sale, hire, or award, or in computing any basic charge or payment for services rendered on the basis of weight or measure and includes any accessory attached to or used in connection with a device that may affect the accuracy of the device.

The capacity of an instrument or device will be determined by the manufacturer’s rated capacity.

The licensing period is from February 1 to January 31 each year.

Any device or instrument shall be considered rejected if the license for that device or instrument is not renewed thirty (30) days after expiration.   A person failing to pay the annual license fee after forty-five (45) days following the expiration date forfeits the right to use the instrument or device for commercial purposes, and the instrument or device may be taken out of service by the ISDA Bureau of Weights and Measures until the license fee is paid.

Any device being used commercially that has not been initially licensed is also considered rejected when found in operation sixty (60) days after implementation of these rules.

In addition to commercially used weighing and measuring instrument and devices, W&M may inspect and test non-commercial devices as requested by the owner or user.   The cost of such tests will be the actual costs incurred in travel and testing (at least 3X the license fee or more depending on mileage).

A dated and signed Non-Commercial affidavit needs to be accomplished for devices in the WM system for which it can be shown no commercial use is being made.   These forms are available from and signed in the presence of the local ISDA W&M inspector.

Frequently Asked Questions about Device Licensing