Model: -2234C+
Material: ABS Plastic
Display: 5-digit 18mm(0.7") LCD Display
Measuring Range: 2.5RPM - 99,999RPM
Resolution: 0.1RPM at 2.5-.9RPM, 1RPM at 1000-99,999RPM
Accuracy: ±(0.05%+1 digit)
Measuring Distance: 50-500mm / 2-20in
Time Base: 6MHz Quartz Crystal Oscillator
Range Selection: Auto range
Sampling Time: 0.8s(over 60RPM)
Power Supply: 1 x 9V 6F22 Battery(NOT included)
Power Consumption: Approx. 30mA
Working Temperature: 0℃ ~ 50℃(32℉ ~ 122℉)

The principle of this tachometer is very simple, the laser head emits red light after the reflection of the reflective paper, dipole induction tube induction, IC calculate the speed.
NOTE: 1. Must be attached to the reflective paper 2. test distance 5CM-50CM

Test method.
A: Install the battery(NOT included in the package), to be tested on the object stick a reflective mark C, installed batteries and press the test TEST button, so that the visible beam of light and the target to be measured in a straight line D. To be displayed after the value is stable, release the test TEST button, at this time there is no display, but the maximum value of the measurement results, the minimum value of the last displayed value are automatically stored in the instrument, press the MEM memory key, according to a certain rule to display Some measurements.
B: Low speed measurement: In order to improve the measurement accuracy, when measuring very low speed, it is recommended that the user put several reflective markers evenly on the object to be measured, at this time the reading on the display divided by the total number of reflective markers to get the actual speed value.

Package list:
1 x Digital Tachometer
1 x Storage Bag
3 x Reflective Tape
1 x User Manual