I bought two TS13C-M sensors from Amazon to monitor outside temperatures. The units are well made, which is something I expected because I have experience with Meade's telescope optics as well.
I use these to monitor for frost in two outdoor locations. When left side by side the two units consistently display the same temperature or vary by no more than 2 tenths of a degree Fahrenheit.
The unit's battery compartment door includes an internal o-ring and has 4 corner screws each threading into metal, not plastic. The units are very easy to hang on a post or the wall.
I am very happy with my purchase so far, especially for the price.






