To accommodate more Water Sensor installations, you'll find that the probes extend 1/2". If you are attempting to install your Water Sensor just off the floor by attaching the sensor to your base boards, make sure to extend the probes before installing and install the sensor with the probes touching the floor. Once installed, slide a thin plastic card (a credit card works perfectly) underneath the probes to push them back into the sensor a small amount.

Be careful; if you do not push the probes off the floor a small amount you run the risk of false alarms.