This document is a user's guide for Extech's Digital Tachometer, providing information on the measurement range, features, and specifications of the product.
This document is the user's guide for the Extech 461891 Digital Tachometer, a professional meter designed to measure rotation speed and surface speed. The device features a custom one-chip LSI microprocessor circuit and a quartz crystal time base for accurate readings on a 5-digit multi-function LCD display. It includes cone, funnel, and surface speed test wheel attachments to accommodate various measurement needs.
| Rotation Speed Range | 0.5 to 19,999 rpm |
|---|---|
| Surface Speed Range | 0.2 to 6560 ft/min |
| Time Base | Quartz crystal |
| Display | 5-digit multi function LCD display |
| Power Supply | 4 x 1.5V AA batteries |
| Operating Temperature | 32 °F to 122 °F (0 °C to 50 °C) |
The device measures rotation speed from 0.5 to 19,999 rpm.
Press and hold the Memory button once to display the last value with the "LA" icon.
Extech recommends that calibration be performed on an annual basis.