Color: Grey - Material: Plastic - Display: 2.5" LCD - Measuring range: 2.5~99999 RPM (Photoelectric rotating speed) 0.5~19999RPM (Contact rotating speed) 0.05~1999.9m/min (Line contact rotating speed) - Resolution: Photoelectric: 0.1RPM Contact: 0.1RPM Line contact: 0.01m/min - Accuracy: +/- 0.05% - Sampling time: 0.8sec - Effective measuring range: 50mm~500mm (laser) - Operating current: 50mA - Powered by 4 x 1.5V UM-3 batteries - Widely used to measure car tire speed or motor speed etc. - Package includes: - 1 x Tachometer - 1 x Surface high speed wheel - 3 x Measuring joints - 3 x Tapes - 2 x Screws