[nirav72]

yeah, I just noticed that they have couple of heavy duty sensors that are listed under the probe section that seem have temp range as low as -50. So those would be ideal for standing freezer.

They don't seem that expensive either. https://store.wirelesstag.net/products/outdoor-probe-basic

Good to know about pushover. That's been my preferred notification service for many years.

They also have an API. Although not sure if it runs locally or on cloud. I'll have to do some reading. - https://www.wirelesstag.net/apidoc.html

Thanks for the recommendation.