$124.50
The best conductivity pen on the market
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Features:
– Measures conductivity and temperature
– Selectable units for conductivity and temperature
– Backlit LCD display
– Calibration optional
– Successful EC or ppm calibration indicator
– Hold reading function
– Low battery indicator
– Fully waterproof
– Auto off function
– Automatic temperature compensation
– 1 x AAA alkaline battery included
Connect a non-return one way check valve to air line tubing of the air pump to prevent water back-siphoning down your air line when there is a power outage.
Adjustable speed with 350 litres to 700 litres air out put per hour
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