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The AD33 is a waterproof Conductivity tester, that also measure and display 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 temperature is factory calibrated and the user can perform an adjustment only. 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.