Purchased the ThermoPro TP60S Digital Wireless Remote Thermo-hygrometer, for monitoring our greenhouse temperature.
Device can be used on its own or as in our case, we purchased an additional sensor ( up to 3 can be added).
The device records Max and Min Temperature and Humidity %, the display also records the temperature and humidity on the sensor itself, effectively 4 sensors if 3 sensors are added.
We were a little sceptical on the range of the wifi claim, but ours easily reaches the greenhouse some 30m away from the farm house.
Great Product https://www.amazon.co.uk/dp/B07G2YM494/ref=sspa_dk_detail_2?psc=1&pd_rd_i=B07G2YM494&pd_rd_w=Ndd57&pf_rd_p=e2bfafb5-111e-4906-b089-5d691a51d45f&pd_rd_wg=2Acc0&pf_rd_r=EJCHXQNCEXRNHEYV1XQY&pd_rd_r=94e447bc-4f05-11e9-b6f8-334814188289