This user guide covers the operation, safety precautions, and specifications for the Extech RPM33 optical and contact tachometer.
The Extech RPM33 is a digital tachometer capable of measuring speed (RPM), total revolutions (REV), frequency (Hz), surface velocity, and length. It features a high-resolution backlit LCD display with MAX-MIN-AVG storage capabilities and includes both non-contact optical measurement using a laser pointer and contact measurement modes. This manual is written in Chinese.
| Display | 5-digit LCD with backlight |
|---|---|
| Laser Class | Class 2 (<1mW) |
| Detection Distance (Optical) | 50 to 500mm |
| Power Source | 9V Battery |
| Weight | 151g (5.3oz) |
The device can store up to ten (10) reading sets for each measurement session.
The display will show a BAT icon indicating that the battery needs replacement.