This is an invaluable aid in the effective understanding of the performance characteristics of reciprocating type air compressor. The compressor may be run using an AC or a DC motor. Various parameters like pressure, suction air flow, compressor speed, power input, etc., are measured. Compressor of single cylinder, two cylinder single stage and two cylinder two stage types can be studied. Optionally, it has a facility to vary the speed of the motor to get various performance parameters for better understanding.