Adwa AD-35 Waterproof EC/Temp Pocket Tester:

AD35 is a waterproof Conductivity tester, that also measures temperature. The housing has been completely sealed against humidity. All Conductivity readings are automatically temperature compensated, and temperature values can be displayed in °C or °F units. Conductivity calibration is automatic at one point, while the temperature range is factory calibrated and the user can only perform an adjustment using an accurate reference thermometer.

The AD33P probe supplied with the meters is interchangeable and can be easily replaced by the user. The encapsulated temperature sensor allows fast and accurate temperature measurements and compensation. To prolong battery life, these models are provided with an auto-off feature that turns them off after 5 minutes of non-use.

Moreover, when batteries become too weak to ensure reliable readings the meter automatically turns off.