Description： VIBRATION/TACHOMETER, 3 in 1 Model : VT-8204 * Separate professional vibration sensor. * Vibration meter : Acceleration : 200 m/s2, RMS, PEAK, Max. Hold, g, ft/s2. Velocity : 200 mm/s, RMS, PEAK, Max. Hold, cm/s, inch/s . Displacement ( p-p ) : 2 mm, Max. Hold, cm, inch . * Tachometer ( photo ) : 10 to 100,000 RPM. Tachometer ( contact ) : 5 to 19,999. RPM Tach. ( surface speed ) : m/min., ft/min. inch/min. * Laser photo tachometer. * 1600 Data logger point. * Data hold, record ( Max., Min. ) * Optional IR probe, IR-962. * RS-232 computer interface. * DC 1.5V ( UM-3, AA ) x 4 PCs. * Patented.