INKBIRD IBS-P02R Pool Thermometer with IBS-M2 Wi-Fi Gateway Combo, Wireless Swimming Pool Thermometer Set, App Control, 9-Channel Monitoring, for Swimming Pools, Hot Tubs, Spas. 3.7 out of 5 stars 85. 100+ bought in past month. $47.59 $ 47. 59-$65.99 $ 65. 99. FREE delivery.