AGPTEK tachometer is a high quality instrument to measure the Rotational Speed (RPM) with wide measuring range and high resolution. 
Display: 5 digits, 18 mm (0.7 inch) LCD with Function Annunciation.
Testing Range: 2.5 ~ 99,999 RPM (rate / min).  
Resolution: 0.1 RPM (2.5 ~ 999.9 RPM) .
1 RPM (over 1,000 RPM).  
Accuracy: (0.05 % + 1 digit).Powered by 3AAA Battery.（Including） 
Sampling Time: 0.8 seconds (over 60 RPM).
Memory Function: Maximum value, Minimum value and Last Measured value.  
Detecting Distance: 50 ~ 500 mm (2 ~ 20 inch) 
Time base: Quartz Crystal.  
Circuit: Exclusive one-chip of microcomputer LSI circuit.
Power Consumption:Approx:35mA（LED） Less than 30 μW（Laser）
Operating Temperature: 0 ~ 50℃ (32 ~ 122℉ ). 

Dimension: approx. 131 (L) x 70 (W) x 29 (D) mm (5.16 x 2.76 x 1.14 inch). Weight: 4.90oz 
Come with storage case and instruction manual.

NOTE:
When you point the machine to the target object, please use the Infrared beam and make sure every-time you aim it at the same level
If you find the product can not be turn on or Reading is not correct, please contact our Customer Service first, we offer three months refund and one year warranty
When it is not used please take the battery out.
The laser class of this digital tachometer is CLASS 1, do harmless to humans and pets, but don't point to people's eyes when using it.