I got these on Amazon and they are incredible. I have one in the grow tent, and one in the drying tent. You can log into these suckers from anywhere, right on your phone. You can even set text alerts if conditions go out your requirements. They no only show, but log temp and humidity. I can see a graph of what my humidifier, or dehumidifier and temps do over night or to make sure the equipment really is keeping the levels I sent. Their a little pricey but work it when your trying to control RH and temp, because the dehumidifier brings the temp up. I got 2 and can see them both at the same time. Life savers fir weed plants.
And there is no subscription fee.
Temp Stick Wireless Remote WiFi… Amazon.com