This portable easy-to-use tachometer is ideal for taking both optical and contact measurements of rotational and linear motions. Use the tachometer in optical mode for hard-to-reach locations or for applications within close proximity to unsafe moving machinery. Simply attach the included adapter with probe tip to easily take contact measurements. The digital tachometer features an easy-to-read LCD that displays high-accuracy precision measurements up to ±0.02% of reading. Rugged design will withstand your most challenging conditions. Additional features include memory function that stores the mean, maximum, minimum, and last readings, and low-battery warning indication.