Thomas 4262 Traceable Tachometer with Red LED Pointer, 1.75" Width x 4.75" Height x 1.25" Thick

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 (24" supplied) and counts rotations. In two seconds it provides rock solid answers from 10 to 99,999 revolutions per minute (RPM). Five-digit resolution is 0.001, 0.01, 0.1, or 1 depending on the revolutions displayed. Accuracy: +/-0.04 percent of reading + 0.02 RPM, +/-0.04 percent of reading + 0.2 RPM, +/-0.04 percent of reading + 2 RPM, +/-0.04 percent of reading + 22 RPM. Unit is designed to measure centrifuges, pumps, rollers, shafts, gears, motors and moving surfaces. Hold button freezes results. Precision quartz crystal insures stable and repeatable results. LCD digits are 1/2" 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). Measures 1.75" width by 4.75" height by 1.25" thick.