TPI 122 Digital MultimeterThe TPI Model 122 with adapter range for optional accessories is a compact, basic DCV 0.5% accuracy DMM.When using the Model 122, press the DATA-H button at any time on any function or range to freeze the reading on the LCD display. This function is very useful when measuring in locations where the display is difficult to read.HVAC/R Applications: Line voltage Control circuit voltage Heating element resistance (continuity) Compressor winding resistance Contactor and relay coil resistance Continuity of wiringElectrical Applications: Measure line voltage Continuity of circuit breakers Voltage of direct drive DC motors 9V Battery