"CLT101 LUCKY REPTILE THERMOMETER-HYGROMETER PRO This slim thermo-hygrometer has a combo sensor for measuring the temperature and humidity. The device can be placed outside the vivarium, where it is protected from humidity and is easy to read, while the combo sensor is placed inside the vivarium. A Min/Max function is available to store the highest and lowest measured humidity and temperature values."
i use the exo terra ones at the moment i found there was quite a bit of difference between them and my other two (make unknown) plus the fact i can switch between f and c for when im havin a hard time remembering the conversion i find them a lot better.