DT-2234A+ Digital Photoelectric Tachometer, Digital Hour Meter

Display: 5 digits, 18mm LCD
Test 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: Automatic
Detecting Distance: 50 to 200mm/2 to10inch(LED)
Battery: 6F22 9V
Power Consumption: Approx. 35mA (LED)
Operation Temp.: 0 to 50 C (32 to 122 F)
Size: 131×70×29mm
Weight: 160g (including battery). 
Memory: Max. Value, Min. Value, Last Value.