Woot offers FERROZA Wireless Pool Thermometer | IPX for $9.80 (orig. $19.99) + free shipping with Prime.

Product Description:
Stay Ahead with FERROZA's Wireless Pool Thermometer Experience unparalleled accuracy with the FERROZA Wireless Digital Pool Thermometer. Designed for both indoor and outdoor use, this IPX7 waterproof floating thermometer delivers real-time temperature updates every 50 seconds, ensuring your pool or hot tub is always at the perfect temperature.​ With a transmission range of up to 196 ft, monitor your water's temperature from the comfort of your home. Its versatile design makes it suitable for swimming pools, hot tubs, ice baths, and fish tanks. Plus, the multi-device connectivity feature allows simultaneous monitoring on up to three devices, providing flexibility and convenience.
 

• 🎯 Precision at Its Best Achieve accurate temperature readings within ±2°F, ensuring optimal comfort for your swimming experience.
• 📡 Extended Wireless Range Monitor water temperature from up to 196 ft away, allowing convenient indoor tracking without stepping outside.
• ⏱️ Real-Time Monitoring Receives temperature data every 50 seconds, keeping you informed of any changes promptly.
• 🌊 Versatile Applications Ideal for swimming pools, hot tubs, ice baths, and fish tanks, catering to various aquatic environments.
• 📲 Multi-Device Connectivity Connects with up to 3 devices simultaneously, providing comprehensive monitoring options.