Does it have to be your phone? Iโve got a system that has a small โbaseโ unit with three satellite units. The base shows the temp and humidity at that location and from the three satellites. Fairly sure I got it on Amazon (of course).
Tom Wilds
Blythewood, SC
2016 Newmar Baystar Sport 3004
2015 Jeep Wrangler 2dr HT