Set of 3 Round Thermo/Hygrometer Holders for Mason Jars 7 CM Leaf

This custom-fit PETG holder transforms your canning jar into a practical mini climate meter. The holder simply clips onto the inside of the lid (7 cm inner diameter) and keeps your hygrometer securely and vibration-free in position – ideal for humidors, fermentation jars, or DIY climate chambers.

Holder Details:

• Suitable for canning jar lids with a 7 cm inner diameter

• For round hygrometers with a diameter of 4.1 CM

• Printed from robust PETG for long durability

• No gluing or screwing required

• Hygrometer can be removed at any time (e.g. for battery replacement)

• Includes 3 holders WITHOUT thermo/hygrometer!