Good Probe holder for the price, won't fit all frames
For the price this is an outstanding probe holder. Many options for adjusting the height and once mounted it is very secure. Well made as well, and should fit just about any size probe out there.
The only problem I have with it is that the bend that slips over the frame of the aquarium is not made big enough to fit anything but a 10g or smaller tank. I had to heat the bend and reshape it to fit on my 40g breeder and 55g tanks. Even then it doesn't fit perfectly on the frame.
This would be a simple thing to fix, just make the bend larger.
If you do purchase this for a tank larger than 10 gallons be prepared to reheat and reshape the bend to make it work!