Buy ETI Digital Thermo-Hygrometer – a low-cost digital thermo-hygrometer equipped with an easy to read dual display, simultaneously indicating both temperature and humidity. * Easy to read dual display, simultaneously indicating both temperature and humidity * Compact and attractively designed unit * Indicates and records maximum and minimum readings of both temperature and humidity * Max./min. memory * High/low alarm * Powered by single AAA alkaline battery, for suitable replacement see Batteries section