digital tachometer 1.RPM Tach 2.Distance: 50 to 500mm/ 2 to 20 inch 3.Current: Max 50mA 4.Power: 4 x 1.5VAA (UM-3) Product Name: DT2234A+ LCD Laser Digital Tachometer RPM [ECA24] Features:100% BRAND NEWCloser to objects without measuring RPM Wide measuring range and high-resolution Final value, maximum, minimum auto store Expensive microprocessors, LSI integrated circuit, quartz time base can ...