This adds support for the Securifi Water Sensor SZ-WTD02N. This model doesn’t have a tamper switch or a temperature sensor.
Once you add this as a Device Handlers page at https://account.smartthings.com it will add support.
To pair, simply go the the SmartThings mobile app and add a thing. It should discover the sensor once you add the batteries to it.
If you have any questions please let me know.
UPDATE: Found these sensors at Home Depot for less than 30 bucks each: