A piezo buzzer emits audible signals using the housing area among the four keys as a diaphragm, so that
no hole is required for a loudspeaker.
The top side carries four keys made of silicone rubber, which provide a clear tactile feel, and which can
be easily operated even with heavy working gloves. The keys are:
Function key (arrow key) to select various functions, symbol
Signal key for audible signals and selecting alarm thresholds, symbol
A socket on the left-hand side of the instrument serves to connect external probes. The probe connector is
equipped with a locking, which has to be observed when plugging or unplugging the connector, see
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