sewerin Snooper Mini - Increased Gas Concentration; Setting the Zero Point - When and How

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5.2 Increased gas concentration
An automatic audio signal makes the user always aware of an increased gas concentration.
Audible signal of the device (loudspeaker key)
z switched on: the interval signal gradually changes to a steady tone
z switched off: steady tone sounds as soon as the device measures a value higher than 1 vol.%
5.3 Setting the zero point – when and how?
When working with the SNOOPER mini, the zero point may start to drift (e. g. if the device is ready
for measuring and put aside for some time). In this case, the display indicates a value deviating from
zero.
z Press briey on the ON/OFF key. ZRO is indicated on the display. The device is ready to reset
the zero point.
z Re-press briey on the ON/OFF key within 5 seconds. The zero point is reset.