Magnetic housing for thermometer-hygrometer in filament dryer

I designed this to hold the hygrometer up in one corner of a Sunlu Filadryer S1, but it may be compatible with other housings as well.

It features a holder and a knob, held inside and outside of the dryer by round 3x5 mm magnets.

An additional (and optional) pin allows to remove the holder while keeping the knob in place.