User Guide

9. Questions and answers
This chapter gives answers to frequently asked questions.
Question Possible causes Possible solution
lights up · Instrument battery is almost spent. · Replace instrument battery.
Instrument switches · Auto Off function is switched on. · Switch function off.
off automatically. · Residual capacity of the battery is too low. · Replace battery.
Display:
----- · Probe is not plugged in. · Switch instrument off, connect probe
and switch instrument back on again.
· Radio contact with radio probe is · Switch radio probe on, if necessary
interrupted. register radio probe again.
· Probe break. · Please contact your dealer
or Testo Customer Service.
Display: uuuuu · Permitted measuring range · Keep to permitted measuring range.
was undershot.
Display: ooooo · Permitted measuring range · Keep to permitted measuring range.
was exceeded.
Instrument settings are · Power supply was interrupted for a · Re-enter instrument settings.
no longer correct long time.
If we are unable to answer your question, please contact your dealer or Testo
Customer Service. Contact details can be found on the guarantee card or on
the Internet under www.testo.com .
9. Questions and answers52