This holder holds your basic Humidity/temp meter

Basic sensor you can buy anywhere (link to aliexpress below)

https://nl.aliexpress.com/item/1005002907439517.html?spm=a2g0o.productlist.0.0.24e1518cpmCqsP&algo_pvid=8920febb-4014-4c64-83a4-b1a211246e22&algo_exp_id=8920febb-4014-4c64-83a4-b1a211246e22-13&pdp_ext_f=%7B%22sku_id%22%3A%2212000022717771369%22%7D&pdp_npi=1%40dis%7CEUR%7C%7C1.77%7C%7C%7C%7C%7C%402101e9cf16517663225943548ef7ea%7C12000022717771369%7Csea