The file 'Magnetic Hydrometer Holder 3D Printer Model' is (stl) file type, size is 71.8KB.
I recently acquired these hydrometers:
https://www.amazon.com/dp/B08P3QJJZL?psc=1&ref=ppx_yo2ov_dt_b_product_details
These holders have 3 6mm magnet holes (because Gridfinity) such that you can put them anywhere. the inverted one is probably unnecessary for the overwhelming majority of uses, but it allows for the hydrometer to attach to the back of something and hang down.
InvertedMagneticHydrometerHolder.stl | 157.6KB | |
MagneticHydroMeterHolder.stl | 141.3KB |