Features Wide Measurement Range: High resolution. Increase the scope of use. In order to adjust the engine idle speed; the speed exceeds the alarm channel of the reminder; the maximum speed since the engine is started can be viewed. Easy to Use: LED backlight display solves the problem of night reading, easy to use. Keep an eye on the engine current and maximum temperature through the probe sensor. Durable Material: The Tachometer Speedometer is made of ABS, which is resistant to corrosion and oxidation, increasing its service life. Easy to install in the correct location. Choice: There are 2 different colors to choose from, you can choose according to your needs. Rugged design, reliable performance provides accurate measurements in seconds. Ideal for applications where contact tachometer use is unsafe or out of reach. Automatic and Manual Mode: Hand-held gun shape, easy to operate. Automatic or manual mode can be selected, and the measurement range is wide. Hand-held tachometer, gun-shaped, easy to operate. Automatic or manual mode can be selected, and the measurement range is wide. Specification: Item Type: Tachometer Material: ABS Optional Color: Black, Red Model: HS2234 Effective Measuring Distance: 50~500mm Display: 5 bit LCD backlight display Measuring Range: 2.5-99999 RP/Second  Measurement Resolution: 0.1 RPM Measurement Accuracy: 0±05% Sampling Rate: 0.5 seconds Time Base: Quartz crystal Operating Temperature: 0~50℃ Storage Temperature: -20-70℃ Batteries: 2pcs AAA batteries (not included) Power Consumption: About 25-40Ma Package List: 1 x Tachometer 1 x Manual 3 x Tape  Package List 1 x Tachometer 1 x Manual 3 x Tape