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TEMP-1 Multi-Probe Splitter Guide

The TEMP-1 comes with an optional 3.5mm Multi-Probe Splitter which can be used to monitor a fridge, freezer, fish tank, pool, hot tub, etc with up to 4 probes.

Firmware version 25.11.20.1 or newer required for TEMP-1 and TEMP-1B

The multi probe support was added in November of 2025. If you are using an old TEMP-1 or TEMP-1B that hasn't been updated then please visit our reflashing guide for the TEMP-1 and TEMP-1B. Alternatively you can update your devices following this guide!

1. To use your TEMP-1 Multi-Probe Splitter gently plug it into the 3.5mm port on your device.

Multi-Probe Splitter 3.5mm plug being inserted into the TEMP-1 probe port

2. Plug in your long or short temp probes into the Multi-Probe Splitter.

Temp probe plugs being connected to the Multi-Probe Splitter sockets

Power on your TEMP-1 after plugging in all of your probes!

The TEMP-1 will look for the probes at boot and mark them failed if you power on and plug in the probes after. Simply power cycle your device and they should show up!

3. Go to the device page of your TEMP-1 in Home Assistant and confirm the Temperature Probe is selected from the dropdown.

TEMP-1 Controls card in Home Assistant with Temperature chosen in the Select Probe dropdown

4. Enable the disabled 3rd and 4th temp probe entities if you have more than 2 probes!

TEMP-1 device page in Home Assistant enabling the disabled Temperature Probe 3 and 4 entities

5. Once completed you will see all four probes updating the temperature!

TEMP-1 sensors in Home Assistant showing readings from all four temperature probes

6. To rename the probes you can edit each probe and choose a unique name such as "Fridge Probe" and "Freezer Probe" as shown below!

Renaming TEMP-1 probe entities to Fridge Probe and Freezer Probe in Home Assistant

Do not leave your sensor outside or let it get wet!

The TEMP-1 should not be left outside for long periods of time or allowed to get wet. You will need to use another case around your TEMP-1 if there will be high moisture content in the air or if it is expected to rain.