I have had the device for a couple years now. Mine has held up pretty well. I attached a 16 oz lead weight to it and it takes the probe down fast and keeps it down.
I also use it to measure the temp and DO of the big hole in the creek behind our hunting cabin(trying to see if trout with hold over in it during the summer). The readings I get both temp and DO wise seem to be reasonable.
It is excellent for finding the thermocline in lakes that I fish. Makes trolling for trout a lot easier. But I really don't know how accurate the DO sensor is on it. The temp sensor from what I can tell is extremely accurate.
