TESTO 6681 Instruction Manual page 55

1.4.6.8 Calling up Main Menu Ident
6681
Serial 11111111
The serial numbers of the transmitter and probe can be read off.
1 In Measuring Mode, press SET, select Main Menu Ident using  or 
and confirm selection with SET.
The type, firmware version and serial number of the transmitter are
displayed.
2 Press ESC to return to the Main Menu Ident or read off the type,
firmware version and serial number of the probe using  or  and
then press  or  to return to the Main Menu Ident.
3 Continue to Main Menu Adjust using  or  or return to Measuring
Mode by pressing ESC.
1.4.6.9 Editing Adjust main menu
A reference value can be entered for both relative humidity (RH) and
temperature (°C/°F) for the 1-point adjustment. Please refer to the description
in chapter 1.3.3.2.
In addition, the analog outputs can be adjusted. See chapter 1.3.3.4 for
instructions on how to do this.
The 2-point adjustment for the adjustment points 20 %RH
and 80 %RH is carried out via the user menu.
For the adjustment points 11.3 %RH and 75.3 %RH, the 2-
point adjustment is carried out via the adjustment buttons or
the P2A software, see chapter 1.3.3.3 or volume 2, chapter 3.
Instruments or probe type
2.01
Firmware version
Serial number
testo 6681
- 1.4 Operation 55