A hygrometer or humidity meter is an instrument used for measuring the moisture content in the atmosphere. The components of these measurements include temperature, pressure, mass, or the charge present in a substance as moisture is absorbed. Modern electronic devices use the condensation temperature or electrical resistance changes to measure humidity differences. Hygrometers measures the relative air humidity to verify desired laboratory conditions and protect materials against atmospheric interference. Multiple types of these weather instruments include mechanical hygrometer and digital versions equipped with remote sensors and calibration kits. Humidity control in labs is made possible by maintaining the desired level of humidity determined with the help of high precision hygrometers.