I bought this cheap chinese pool thermometer and wanted to integrate it to home automation system.
I used Wemos D1 mini ESP8266 board with RX470-4 433,92 MHZ receiver to receive signal from thermometer.
In picture there is also additional wiring for BME280 sensor.
Receiver (https://www.aliexpress.com/item/32959397488.html?spm=a2g0s.9042311.0.0.27424c4dd2gmC9)