User's Manual

The calibration threshold enable will not affect the test results, and the instrument does not
need frequent black and white calibration. It is recommended to perform black and white
calibration only when it is used for the first time, when the temperature difference
environment has changed significantly, after a long period of unused use, or when the
measurement data of the instrument is found to be inaccurate.
3.5.6 Language selection
The system language can be Chinese or English.
3.5.7 Sleep time
Set the automatic shutdown time after the screen is turned off. The sleep time is divided into
"30 seconds", "60 seconds", "90 seconds", and "no sleep". If you choose not to sleep, the
instrument will not automatically shut down. If it is set to "30 seconds", the instrument will
count when the screen is off, and will shut down after 30 seconds and enter the power
saving mode. The meanings of "60 seconds" and "90 seconds" are the same as above.
When the instrument is sleeping, you can start the instrument by short pressing the operation
button.
3.5.8 Backlight time
Set the display lighting time, the time is divided into "30 seconds", "60 seconds", "90
seconds", "normally open". If normally open is selected, the screen will always be on. If it is
set to "30 seconds", the instrument will count from the last operation, and the display will turn
off after 30 seconds. The meanings of "60 seconds" and "90 seconds" are the same as
above.
3.5.9 Factory reset
Select "Restore Factory", the instrument will clear all measurement records and user settings,
and restore to the factory state.
Note: After restoring the factory settings, all data cannot be restored, please operate with
caution.
3.5.10 Device information
Display instrument model, SN code, software and hardware version number and other
information.
4. Daily maintenance
1) This instrument is a precision optical instrument. Please keep and use the instrument
properly. Avoid using and storing the instrument in humid, strong electromagnetic
interference, strong light, and dusty environments. It is recommended to use and store the
instrument in a standard laboratory environment (temperature 20 degrees Celsius, 1
standard atmosphere, humidity 50~70%RH).
2) The whiteboard is a precision optical element. It should be kept and used properly. Avoid
hitting the working surface with sharp objects, avoid contaminating the working surface with
dirt, and avoid exposing the whiteboard under strong light. Clean the working surface of the