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     Hygrometer have many applications: in museums, at home, monitoring weather, in cigar humidors. A hygrometer is an instrument that records relative humidity, and digital  hygrometers provide this information in easy-to-read digital format. For many applications, temperature is also needed, and most hygrometer are thermo-hygrometers that measure both relative humidity and temperature. Choosing a hygrometer involves a detailed knowledge of where it will be placed, degree of accuracy needed and if it will be used for spot-checking or constant monitoring.

Instructions

     1, Decide if the  digital thermometer will be for indoor or outdoor use. outdoor thermometers are waterproof, rugged and designed for extreme swings in humidity. Indoor thermometer are often (but not always) designed for greater accuracy.

     2, Decide what level of accuracy is required. The accuracy of hygrometers varies by model and price, and margin of error varies from 1 to 5 percent. For most applications a high degree of accuracy is not needed, but monitoring of highly sensitive objects (such as many museum artifacts) will require great accuracy. To improve accuracy, use a hygrometer  to calibrate hygrometers

     3, Decide if the hygrometer will be for spot-checking conditions or constant monitoring. Hygrometers used for spot-checking are very different than models designed for constant monitoring. Data loggers are special types of digital thermomerter that record constant data (at user-specified intervals), which can be downloaded into a computer.