EN50082-2 and EN55011. Instructions NOT supplied in English. Compact tachometers TA 1220 - 10 mm display. LED tachometers, 4 x 10-mm high red LED digits. Displays speeds, rates and frequencies. Measures feedthrough time. NPN, PNP, NAMUR, TTL or sinusoidal pulsed input signal from 100 600 Vac. Displayed in seconds, minutes or hours. Measurement principle based on measuring the period of the input signal. Mounting bracket supplied.