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Important displays
Display Meaning
Battery capacity (bottom left in display):
4 segments in the battery symbol are lit: Instrument battery is fully
charged
· No segments in the battery symbol are lit: Battery is almost spent
Print function: Readings are sent to the printer
Upper alarm limit: Lit if exceeded
Lower alarm limit: Lit if undershot
Measurement channel: Radio probe (the number of “radio wave”
segments shown indicates the strength of the signal)
3.2 Interfaces
Infrared interface
Measurement data can be sent to a Testo printer via the
infrared interface on the head of the instrument.
Sensor socket(s)
Plug-in measuring probes can be connected via the probe
socket(s) on the head of the instrument.
Radio module (accessory part)
Radio probes may only be used in countries in which
they have been Type Approved (see application infor-
mation of the radio probe).
A radio measuring probe can be connected via the radio
module.
3.3 Voltage supply
Voltage is supplied by means of a 9 V monobloc battery
(included in delivery) or rechargeable battery. It is not
possible to run the instrument from the mains supply or
charge a rechargeable battery in the instrument.
3. Product description
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