American Marine Wireless Thermometer and Ph Monitors

[Willito]

I bought a used one that worked fine for about two months and then it starting displaying wacky numbers. I think it's the sensor that malfunctioned but haven't had time to prove it. The previous owner had used it for about 6 months. By the looks of it, many reviews I've read had pointed to the sensor not being very durable. I am starting to believe this and probably won't invest any more coins towards it.