Comgrow Dryer Hygrometer

Nothing fancy, this uses the square hygrometers that are around 30mm x 50mm. On the Comgrow dryer, you can unscrew the filament plugs in the lid, slide the holder with Hygrometer into the the holes from the inside and then re-use the clear nuts on the back (after install will be on the front/outside). I added this as i dont think the built in one is very accurate, and it doesnt show humidity when its turned off obviously!7