Pyle Precision Non-Contact Laser Tachometer W/Extended RPM Range, Digital LCD Screen, Protective Case, Black (PST43) Precision non-contact laser tachometer w/ extended rpm range, digital LCD screen, & protective case - 5 digit LCD display - range of 2.5 - 99, 999 rpm - measures at a distance of up to 3.5 ft. Resolution: 0-1000 RPM/0.1RPM; 1,000-9,999 RPM/2.5 RPM; &gt;10,000 RPM (0.025%+1dgt) Automatic range selection - laser output power: &lt; 1mW class II - sampling time 5 Digit LCD Display - Laser Output Power: &lt;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; &gt;10,000 RPM (0.025%+1dgt) - Time base: Quartz Crystal; Automatic Range Selection - Circuit: Exclusive One-Chip LSI Circuit;