The Micro Systems, Inc. C-Band Mini-Tester (Model 38) is a handheld battery powered unit that provides go/no-go testing for the Model 251, 252, and 253 Series C-Band transponders. The Mini-Tester functions to verify proper transponder operation by interrogating a transponder installed and powered in a systems platform. Indicator lights verify the transmission of signals and the received reply. In addition to testing Micro Systems, Inc. products, the Model 38 can be used to test any C-Band transponder in the 5.4-5.9 GHz range

The Mini-Tester is programmable, using the same programming interface kit that is used to program the transponders themselves. This allows for quick frequency changes without opening the unit. The Model 38 is capable of testing units more than 350 feet away.