I have a "little time temp" on a 125 freshwater. It reads 91.6 F or 33.1 C. It felt colder than that to me so I checked it with another and got about 75 F. A LARGE floating thermometer read at about 76 F. I am sure the digital is wrong. I moved the sensor to another spot but am wondering if I can reset this one or just chuck it and use another one.