Diesella Digital Tachometer with combined laser and mechanical contact

Combined contact and non-contact digital tachometer which measures rotation rate and surface speeds. The tachometer includes, reflective tape, cone tip, flat tip, and wheel attachments for measuring surface speeds. 3 pcs. of 1,5V AA batteries included. Comes with a foam-fitted, hard-plastic storage box. • Measures rotation in RPM • Measures surface speed in m / min. • Memory automatically remembers 3 values ​​- last, highest and lowest value. Measuring range: • 2,5 ~ 99999 RPM (r/min) non-contact speed • 0,5 ~ 19999 RPM (r/min) contact speed • 0,05 ~ 1999,9 RPM (r/min) contact surface speed Resolution: Non-contact speed: 0,1 RPM (r/min) (2,5 ~ 999,9 RPM), 1 RPM (r/min) (over 1000 RPM) Contact speed: 0,1 RPM (r/min) (0,5 ~ 999,9 RPM), 1 RPM (r/min) (over 1000 RPM) Contact surface speed: 0,01 RPM (r/min) (0,5 ~ 99,99 m/min), 0,1 m/min (over 100 RPM) Measurement accuracy: ±(0,05% + 1 ciffer) Range selection: Automatic switching Time base: 6HMz quartz crystal vibrator Effective distance: 50 mm ~ 500 mm (photoelektric type)