Sonoff SNZB-02 column mount

This is an adapter for mounting a Sonoff SNZB-02 Zigbee temperature and humidity sensor to a steel column.

It uses three magnets harvested from a spent Philips Sonicare toothbrush head (essentially free). Arrange the magnets so they naturally cling together end-to-end as shown in the fifth photo, and epoxy them to the adapter in the same orientation. Stick the SNZB-02 to the adapter with double-sided tape and you're good to go.