Reed Instruments Tachometers, Contact (R7140)

TachometersPhoto/Contact TachometerPatented design incorporates both a photo and a contact tachometer into one precision instrumentRanges: from 0.5 to 20 000 rpm in contact mode; from 5 to 99 999 rpm in photo mode; surface speed from 0.05 to 1999.9 mpm (0.2 to 6560 fpm)Linear surface speed measurements are 0.2 to 6560 fpm or 0.05 to 1999.9 mpmAutomatically holds last reading for five minutes and recalls min. and max. readingsCharacters on the large 5-digit display reverse direction depending on which measurement mode you are inProvides accuracy to 0.05% and permits readings to a resolution of 0.1 rpm in either photo or contact mode