Filament Spool Hygrometer Holder (Rectangular)

This hygrometer holder allows you place your rectangular hygrometer along the edge of your filament spool when storing in vacuum-sealed bags. It makes reading the hygrometer a lot easier. The holder contains 2 parts. You can combine the parts to support spool of different thicknesses: 56 - 57 mm58 - 59 mm60 - 61 mm62 - 63 mm64 - 65 mm66 - 67 mm.