The FMCSA certified ELD list was compiled using product names the agency received from ELD manufacturers. These companies assert that their products meet the general technical requirements for an ELD to qualify as certified.
For an ELD to be considered certified, it must be able to perform as specified in regard to the information the unit must record, the required recording intervals, the method this information is displayed, how it is communicated to a receiving device, and more.
FMCSA certification guidelines are based only on whether the unit is capable of these functions. There is no provision for rating the level of performance.