Always happy Purchasing from First Light Optics. Fast delivery. 100% happy with product.

These are direct replacements for the Desicant tablets inside the ZWO camera range and they work.
The only drawback is having to open the camera to fit them and getting dust on the sensor and inside of the sensor cover which is a pain to remove. This is not a fault of these items though so still 5 stars but come on ZWO, you need a better system that doesn't involve opening up the camera!