Digital Tachometer, Mengshen 2 in 1 Non-Contact & Contact Speed Meter Rotation Tester TH-522

Features:
Dual use for non-contact & contact testing on your needs.
Have 4 different connecting head used for contact measuring.
Wide measuring type: can test rotational speed(RPM), counter rotating(REV),frequency(Hz),surface speed(m/minute; inch/min; feet/min; yard/min and length(meter, inch, feet, yard).
High resolution ratio and 5-digit backlight LCD display.
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