Price history on Walmart.com for
NTI E-LDT600-100 Liquid Detection Sensor w/2-Yr Warranty
See on WalmartProduct info
NTI E-LDT600-100 Liquid Detection Sensor Features: For warning of flooding. 100% waterproof electronics. Detects any conductive liquid. Puddle: 0.6 diameter. Detects liquid depth >0.1 . Available water sensor cable (x) lengths: 1/10/50/100/200/400/600/800/1000 feet. Available 2-wire cable (y) lengths: 5/10/20/50/100 feet. Regulatory approvals: CE FCC RoHS
... read more.