Attic sensor that can handle 0° to 150°F?

[JDRoberts]

For plug ins:

1. Homeseer HSM200. Operating range -4°F to 176

HSM200 Z-Wave Multi-Sensor – HomeSeer

2. Aeotec multisensor 6. Operating range 14°F to 122°. Can be mains powered via a USB cable. May be able to handle higher heat if it doesn’t have batteries: check with the manufacturer.

Smart Sensors - Aeotec

3. zigbee Device manufactured by a community member, Quantities limited. I don’t know the operating range, you would need to check with the creator.

Expandable Zigbee Repeater Solution (With Temperature, Humidity, Pressure and Light sensors)

Update 05/22/2020: After a long development, I have finally manufacture the sensor by the professional in quantity. For convenience, I open a listing in Ebay for those who are more comfortable to go that route. Update 12/2/2018, battery backup support. Here Update 8/19/2018. It is expandable now. See it here. Update 5/6/2018 here. This update incorporate temperature, humidity, pressure and light sensor. These sensors (Bosch BME280 and TEMT6000) are probably the most accurate sensor available. Update 6/19/2018 Xiaomi devices compatibility here. I have chance to pair a Xiaomi Aqara Motion Sensor. So far, I do not see any drop out on the Xiaomi devices. Original: I need for a Zigbee repeater. I am aware of existing solution here. I thought that it would be a fun project…

There are a few others, but I think those are the most popular.

I can’t say anything one way or the other about the sonoff. The brand is generally good, I just haven’t heard anything about that particular device.