testo 240 Bedienungsanleitung Seite 26

4
Instrument d d escription
1st line
Display of measured value (µS/cm, mS/cm, NaCl
mg/l - °C/°F for measurements with temperature
probe) and menu.
2nd line
Display of temperature value
Battery control
When instrument is switched on: battery voltage
During use of instrument: low battery warning
"HOLD" function activated
Calibration menu activated
"Cell constant" calibration menu
Temperature coefficient
Measurement with temperature probe
Auto off function
HOLD key (hold measured values or set values
with manual input function)
ON/OFF key
PAGE key
(call up individual menus)
SELECT key (select menus or set values with
manual input function)
Display / / keyboard