UbiBot DS18B20 Temperature Probe, Waterproof External Probe for Refrigerator,Remote Temperature Monitor for Hot Tub,Swimming Pool,-55 to 125 C,USB Connector (Matches with Ubibot WS1,WS1 Pro only) (3m) 104. $1599. FREE delivery Thu, Jun 15 on $25 of items shipped by . Or fastest delivery Tue, Jun 13. Only 15 left in stock - order soon.