3 Function
Sensor
Used to measure Salt concentration, TDS level, and Temperature. This
area is waterproof.
(ON/OFF) Key
Used to turn the power on and off. After use, the power turns off auto-
matically within one minute.
(MODE) Key
Measurement Mode Selection:
Use the Mode button to select the measurement mode: Salt concentra-
tion in percent (%), Total Dissolved Solids (TDS) in ppm or
Temperature in °C or °F. When the power is turned on, the default
mode is the Salt %.
Repeatedly press the Mode button to switch between each display.
Switching Between Celsius and Fahrenheit:
The Mode key is also used to switch between degrees C and F. When
the temperature is displayed, press and hold the Mode button until the
display changes to °C or °F depending on which is currently displayed.
Hold / CAL Key
Used to freeze the measured value during a test or perform calibration.
Please refer to section (5) and (6) for calibration instructions.
While measuring press the Hold/Cal button to freeze the display. Press
the button again to return the 390a to normal operation.
4
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