User Manual

5 First steps
19
Attaching headset (testo 875-2i only)
1. Open the cover on the left side of the thermal imager.
2. Insert stereo jack of the headset into the headset slot (1).
Mount/remove infrared protection glass
Installation:
1. Attach the protection glass (with black fitting) fastened to the
red mounting ring to the lens and turn the mounting ring
clockwise to the stop.
2. Remove the red mounting ring from the protection glass.
Removal:
1. Attach the red mounting ring to the protection glass.
2. Turn the mounting ring anticlockwise and remove the protection
glass.
After mounting/removing the protection glass, activate or deactivate
the Protection glass option, see Optics..., page 34. If this option is
set incorrectly, the specified measuring accuracy is not ensured.
Mounting/removing high-temperature filter (testo 875-2i only)
Installation:
1. Attach the high-temperature filter (with red fitting) fastened to
the red mounting ring to the lens and turn the mounting ring
clockwise to the stop.
2. Remove the red mounting ring from the high-temperature filter.
Removal:
1. Attach the red mounting ring to the high-temperature filter.
2. Turn the mounting ring anticlockwise and remove the high-
temperature filter.
Activate/deactivate the high-temperature measuring range (350.0 -
550.0 °C or 662.0 - 1022 °F), see Measuring range, page 28, after