Optimal ambient temperature and humidity play an important role in the success of an application While the ideal humidity for indoor living spaces ranges between 40 to 60 % it requires to be higher in studios because eyelash glue requires a room temperature of 18° - 24° and 50% - 80% humidity to be effective and last long. The higher the humidity the quicker is the polymerisation (reaction) of the eyelash glue. Drier ambient temperature slows down the reaction time a lot which proves to be disadvantageous in certain application procedures when freshly stuck adjacent extensions start sticking to one another. This thermometer cum hygrometer is easy to read and is an economical option to keep track of the temperature and humidity and thereby maintain optimum application conditions at all times. It displays temperature humidity date and time on the same screen With clock alarm and calendar functions. Adjustable 12 hour/ 24 hour display system. Flexible placement: put it on the writing desk or hang it on the wall Dimensions: 105 x 98 x 20mm / 4.13 ' x 3.86' x 0.79 '(approx.) Automatic storing of maximum and minimum values and humidity. Technical specifications: Type: Thermometer and Hygrometer Material: ABS Background lighting: none Main/background colour: white | font colour: black Temperature range: -50°C~ + 70°C?-122°F~ + 158°F? Humidity range: 10% ~ 99% RH Power supply: 1 x AAA 1.5V Dimensions: 105 x 98 x 20mm