Key facts
- Brand
- EXTECH
- Model
- RPM33
- Category
- Other Electronics
- Documents
- 2
- Languages
- ZH · EN
- Last added
- 2026-10-16
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Extech RPM33 Optical/Contact Tachometer User Guide
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.
Read onlineExtech RPM33 specifications
| 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) |
All Extech RPM33 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
How many reading sets can be stored per measurement session?
The device can store up to ten (10) reading sets for each measurement session.
What happens when the battery is low?
The display will show a BAT icon indicating that the battery needs replacement.
What is the measuring distance for the non-contact mode?
The device can measure at a distance of 2" to 20" (50 to 500mm).
From: Extech RPM33 Laser Photo/Contact Tachometer User Guide
How many reading sets can be stored per measurement session?
The RPM33 can log up to ten (10) reading sets for each measurement session.
From: Extech RPM33 Laser Photo/Contact Tachometer User Guide