Maintenance And Calibration - VOLTCRAFT 304 Bedienungsanleitung

you can correct some of these malfunctions yourself with relative
ease; please observe the safety instructions in any case!
Malfunction
No display with the
device switched on

Maintenance and Calibration

To ensure the accuracy of the thermometer over a longer period of
time it should be calibrated yearly.
The battery exchange is described under "Handling, Putting-into-
Operation A". To clean the device or the display window please use
a clean, non-linting, antistatic, dry cloth.
Warning!
Do not use carbon-containing cleaning agents, benzines, alco-
hols or the like as these attack the surface of the device. Furt-
hermore, the fumes are detrimental to your health and explosi-
ve. Do not use sharp tools, screwdrivers, metal brushes, etc. for
cleaning.
Possible Cause
Has the battery been used up?
Has the measuring device automatically
switched off after having been idle for
30 minutes?
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