Hello… I am new to this. I am looking for a device that can monitor the temperature of my crawlspace. hello I’m also a smart thing user and would like it to integrate. Any advice would be greatly appreciated
Welcome! 
We need to ask a few questions first, because the device selection can vary depending on your setup.
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what country are you in?
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you have a SmartThings hub, and if so, which model? Or are you operating in a “hub optional” configuration without a hub?
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what material is the floor above the crawl space made of? Cement, wood, composite materials, or ? And are there water pipes in or adjacent to that floor? For these questions, we are looking for architectural features that might block radio signal. One quick test: if you are in the crawlspace near where you want to put the sensor, do you still have a WiFi connection on your phone?
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how cold does the area get? Or to put it another way, what temperature range do you need to measure?
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how frequently do you need updated information? I ask because while most devices of this type will take a new reading every 15 minutes, some integrations only update every 4 hours, and a few even longer than that. Sometimes this is part of a design to save battery life, sometimes it seems to be about cloud traffic, but in any case it’s one of the areas where details matter.
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do you need an integration that reports exact readings, or just one that can alert you if you go above or below a certain range?
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most people are looking for a battery powered device for this purpose, but if there is mains power available in the crawlspace, let us know.
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if you do have a SmartThings hub, your topic title specified WiFi. Do you know you need WiFi, or would you consider a device of another protocol like zigbee?
It is likely that there will be a device that will work for you, but the details do matter.
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