testo 400 is a reference level multi-function measuring instrument that supports temperature, humidity, wind speed, pressure, rotation speed and other measurement functions. This manual introduces the use of the instrument, measurement methods, etc.
The Testo 400 series is a flexible, upgradeable multi‑function measuring instrument that supports temperature, humidity, pressure, wind speed, CO/CO₂, WBGT, NET and many other parameters. It can be equipped with a variety of probes and offers extensive data‑logging and printing capabilities.
This operation manual guides users through initial setup, battery installation, menu navigation, function‑key assignment, printer configuration, error handling, data management and software/firmware upgrades. Technical specifications, power‑supply options and detailed measurement ranges are provided for each supported sensor. This manual is written in Chinese.
| Temperature measurement range | -200 °C to +800 °C |
|---|---|
| Temperature resolution | 0.01 °C |
| Temperature accuracy | ±0.1 °C (‑49.9 °C to +99.9 °C) |
The standard memory can store up to 45 000 measurement values.
The instrument operates from 0 °C to ±50 °C (short‑term up to +60 °C).
A fan‑wheel (叶轮式) probe is used, with a measurement range of 0 to 60 m/s.