Waterproof, but it is need to install waterproof loop and fasten the cap tightly.
Pool sensor floats up to 30m depth and 433MHz wireless up to 100m in open field.
Water temperature: -40~60'C, indoor air temperature: 0~50'C.
Max/min record of indoor and water temperature.
Wireless receives 3 channel's water temperature.
Calendar from 2015 to 2099, time alarm with snooze.
Display with LED backlight(green).
Floating thermometer for pool, spa, bathtub and fishpond.