Use this tachometer for measuring applications including the rpm of motors, fans, rollers, or for additional monitoring of process equipment. Meter is easy to use—apply the reflective tape to the desired object, select RPM or REV mode by pressing the MODE button, and point the laser at the reflective tape on the object under test. The results are immediately displayed on the 5-digit LCD. Press the MEM button to recall the last and min/max readings. The last reading remains in the display for up to 10 seconds before the auto power off feature turns the meter off. Precision laser provides high accuracy for long-distance measurements Take accurate measurements from up to 20 inches (50.8 m) away. Rugged, ergonomic design is perfect for most environments