This Traceable® tachometer, with red LED pointer, offers touchless handheld point-and-shoot at a rotating object and provides instant precision results. Optical no-contact measurements are made by placing a piece of reflective tape on the rotating object. Red LED light locks on the self-adhesive reflective tape (24in supplied) and counts rotations. In two seconds it provides solid answers from 10 to 99,999 revolutions per minute (RPM). Unit is designed to measure centrifuges, pumps, rollers, shafts, gears, motors, and moving surfaces. For accuracy see chart. HOLD button freezes results. Precision quartz crystal insures stable and repeatable results. LCD digits are 1/2-inch high and may be read from 10-feet. Low battery condition is indicated on the display. Impact resistant ABS housing protects the unit. To assure accuracy an individually serial-numbered Traceable® Certificate is provided from our ISO 17025 calibration laboratory. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology). Supplied with a 9-volt battery (for thousands of readings for over a year). Replacement battery Cat. No. 1112. Range: 10 to 99,999 RPM. Resolution: 0.001 RPM; 0.01 RPM; 0.1 RPM; 1 RPM. Accuracy: ±0.04% of reading + 0.02 RPM; ±0.04% of reading + 0.2 RPM; ±0.04% of reading + 2 RPM; ±0.04% of reading + 22 RPM. Display: LCD display. Time Base: 4.0Mhz Quartz Crystal. Sampling Time: 1 sec (>60rpm) >1 sec. (10-60rpm). Operating Temperature: 32 to 122°F; 0 to 50°C. Operating Humidity: Max. 80% RH. Power Current: Approx. 12mA DC. Power Consumption: 2uA (Idle) 11mA (Measurement). Size: 4-3/4 x 1-3/4 x 1-1/4-Inch. Weight: 4oz. Control Company#: 4262.