Digital Tachometer /Engine Tachometer 

Display:5 digits, 31mm  LCDTest Range:2.5 to 99,999 RPM (r/min)Resolution:0.1 RPM (2.5 to 999.9 RPM)           1 RPM (over 1,000 RPM)Accuracy:±(0.05%+1 digit)Sampling Time:0.8 sec. (over 60 RPM)Test Range Select:AutomaticDetecting Distance:50 to 200 mm/2 to 10inch(LED)Battery:3×1.5V  UM-3Power Consumption:Approx. 35mA (LED)Operation Temp.: 0 to 50 (32 to 122)Size: 160×76×40mm Memory:Max. Value, Min. Value, Last Value.

2234A Digital Laser Tachometer