TESTO 6681 Instruction Manual page 59

The 1-point adjustment can be performed
via the user menu (see chapter 1.4.6.9, page 83) or

via the P2A software (see volume 2, chapter 3, page 142) or

directly by means of a Testo handheld instrument (testo 400/650) (see

description of how to proceed below).
Please note that the 1-point adjustment is generally
performed on the basis of the % RH and °C/°F parameters.
 Adjusting testo 6681 using Testo handheld instrument

The service flap is open, a testo 400/650 handheld instrument with a
precision humidity probe is ready.
5
1 Connect Testo handheld instrument 400/650 (1) with connected
humidity reference probe (3) (order no. reference set
0699 3656/20) to the service interface (5) of the testo 6681 via the
adjustment adapter (2) (connected to the probe socket 1 of the
handheld instrument).
testo 6681 Ethernet
1
2
3
4
- 1.3 Commissioning 59