Contact Measurement: Hold the probe close to the object to be measured and rotate synchronously with it. Non-contact measurement: Stick the reflective paper on the object to be measured and measure by aligning the reflective paper on the object to be measured.		Widly Used: Digital Tachometer Tester is one of the necessary instruments in the machinery industry which is commonly used in the range of manufacturing industries such as motor, electric fan, paper, plastic, chemical fiber, washing machine, automobile, aircraft and ship.		Various Measurement Modes: · Line velocity measurement. · Contact RPM measurement. · Laser RPM measurement. · Light Source flicker measurement.