New DT-205LR tachometers incorporate laser technology yet retain our hallmark rugged construction and reliable quality components, both offer incredible value and versatility as they perform non contact and contact applications via the included contact adapter. We are confident you'll agree that these fine units are the most advanced handheld tachometers on the market. Display range: 6 to 99999 rpm. Accuracy: +/-1rpm: 6 to 8300rpm, +2rpm: 8300 to 25000rpm, 25000 to 99999rpm: +/-0.006 percent of reading +/-1 digit (+/-6 rpm max.). Display: 5 digit 0.47" (12mm) high LCD. Measuring units: RPM (on contact using adapter, included) For YPM, mPM, FPM, IPM and Length: YRD, m, FT and IN use 6" cir. Wheel with 200L adapter. Measuring distance: 20' (6m) maximum. Memory system: 13 readings are stored in memory and retained for 5 minutes (last, max., min. and 10 extra measurements). Detection: Laser diode / contact. System control: Single chip C-MOS microprocessor. Over range indicator: Flashing numerals. Update time: 1 second (typical). Batteries included: Size: 2AA 1.5V. Life; Approx. 40 hrs. Low voltage indicator: Flashing "LO BAT" display. Operating temperature: 32 degree to 113 degree F (0 degree to 45 degree C). Construction: Die-cast aluminum housing. Weight: 0.8lbs (365g). Measures 6.6" length by 2.4" width by 1.8" height. Warranty: 1 year. Standard accessories: Reflective tape, 2 cone adapters, 1 funnel adapter, NIST traceable certificate, instruction manual, carrying case, DT-ADP-200LR adapter, master wheel (6" cir.) and 3.5" extension shaft.