Liquid Level Sensor,-40~60℃ Level Sensor with Temperature Display, Tank Level Temperature Sensor, Water Tank Depth Level Meter Sensor Measuring Meter: Amazon.com: Tools & Home Improvement
La Crosse Technology TX6U Wireless Temperature Sensor for 433 MHz units only
Amazon.com: Ambient Weather WS-01PF Color Changing Wireless Pool and Spa Temperature Night Light with Ambient Backlight : Patio, Lawn & Garden
Temperature Meter, TS‑6210 Digital Wireless Weather Station Thermometer Meteorological Temperature Meter, with Durability, Small Size and Long Service Life: Amazon.com: Industrial & Scientific
Amazon.com: ThermoPro TP60S Digital Hygrometer Indoor Outdoor Thermometer Wireless Temperature and Humidity Gauge Monitor Room Thermometer with 200ft/60m Range Humidity Meter : Patio, Lawn & Garden
Amazon.com: Ambient Weather WS-14 Wireless 8-Channel Floating Pool and Spa Thermometer : Patio, Lawn & Garden
Amazon.com: La Crosse Technology TX6U Wireless Temperature Sensor for 433 MHz Units only : Industrial & Scientific
Amazon.com: ECOWITT GW1104 Wi-Fi Thermometer and Hygrometer Sensor, Including GW1100 Wi-Fi Gateway and WH31 Wireless Multi-Channel Temperature and Humidity Sensor, Dip Switches to Switch ℃/℉, 915 MHz : Patio, Lawn & Garden
Amazon.com: ThermoPro TX-2B Fitting Rainproof Transmitter Outdoor Temperature Sensor Wireless Only for TP200B Indoor Outdoor Thermometer Wireless Remote Temperature Monitor, Battery Included : Patio, Lawn & Garden