Hydrometer Spool Holder Humidity Meter Sensor

This is a simple mount for a hydrometer that can be purchase on ebay and amazon. I purchased 10 of them for $16 but they can be purchased in quantities of 1 or 5 as well.

This one was designed for Inland filament, it may or may not fit other brands. This one is sized to fit holes that are 54.7mm with a snug press fit. Please check your spool hole size if its not inland brand.

Once you fit your spool with the hydrometer, place it in a bag with desiccant packs or silica gel to keep it dry. Vacuum sealed bags are even better if you have access to that.