The Testo 460 (0560 0460) Optical RPM Tachometer is a handy, pocket-sized instrument that provides you with quick and reliable rpm readings when carrying out checks on fans, crankshafts, and motors. The ideal distance to the measurement object is between 10 and 40 cm. Simply attach a reflective marker (optional, available separately) to the measurement object, point the visible measurement spot at the reflective marker, and measure. Min./max. values are directly displayed at the press of a button. The Hold-button allows for particularly convenient reading of the measurement values. The illuminated display enables easy read-out of the measurement values even in bad lighting.