Temperatures in Pizzeria freezers 🥶

General
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Sonoff zigbee devices will require a zigbee controller and possible repeaters, as battery devices can not act as network repeaters.

Do the fridges already have a temp display?

Shelly uni and a DS18B20 (-55C) about 25 euros and can be installed in the fridges with existing control gear. No batteries to change.
You could add a cheap esp32 displays Wall mounted Node-RED touch screen device: Request for ideas and volunteers