5 digit LCD display - Laser Output Power: <1mW class II - Battery: 4 X 1.5V AA (Not included) Range of 2.5 - 99,999 RPM - Sampling Time: 1.0 seconds (over 60 RPM) - Case, reflection tape and manual are included Measures at a distance of up to 3.5 ft. - Memory: Last value, Max Value, Min. Value Resolution: 0-1000 RPM/0.1RPM; 1,000-9,999 RPM/2.5 RPM; >10,000 RPM (0.025%+1dgt) - Time base: Quartz crystal; Automatic Range selection - Circuit: Exclusive one-chip LSI circuit;