May I write in german?
If you need the measurements on the fly, you may use the internal Access Point of a Shelly 1 PM generation 2+.
But if you want to store the measurents values, I may have a solution for you, based on a script. This script stores many values into its non volatile storage and you may take it to your home for reading this values. Alternatively you may use a MQTT transfer over your smartphones hotspot without replacing the Shelly, if you use a MQTT subscriber at home.
Btw, my solution via script may be used with a smartphone directly reading the stored values. I've created this script for using MQTT, but it may be used without MQTT.
If you are interested in my solution: https://iotig.eichelsdoerfer.net/index.php/loes…r-shelly-script