This test instrument is used for testing and calibration of electrical and mechanical tachometer generators and indicators.  A high quality DC motor is coupled directly to a 1/4 inch square hole drive (AN Pad).  This tachometer tester output can be converted to a wide variety of adapters and different tachometer interfaces. 

The Model 1921 Tachometer Tester is used for the testing and calibration of electrical and mechanical tachometer generators and indicators, specifically handheld models.  Two variable speed brushless motors eliminate the need for gears while providing for a testing range of 10 to 50,000 RPM.