Non-Contact rotational measurement of speed, using photo-electric technology Measuring range 2.5 - 99,999rpm (accuracy +/- 0.05%)Memory: min, max, last value. Sample time 0.8sec (over 60rpm) Detecting distance: 50 - 500mm Size: 164 x 74 x 37mm. Supplied with a storage bag and 3 x AA batteries
