What is a hygrometer?

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What measures humidity?

In simple terms, a hygrometer is a device that uses a range of different variables to measure the humidity of the air, the first rough hygrometer being invented by Leonardo da Vinci in 1480. For example, some hygrometers use the current temperature and an electric current monitor to accurately calculate the current humidity. Our TP50 uses this humidity calculation which enables the device to further calculate the comfort level of your home for optimal living conditions. Here at ThermoPro, we’d like to think Leonardo would be quite in awe of how far we’ve come.

What instruments measure humidity?

There are two types of devices that can read relative humidity:


1. Analog Hygrometers: This type of hygrometer is the cruder of the two. Analog hygrometers use condensation-sensitive components to read the surrounding humidity and have dial-like reading mechanism. Although most come already calibrated, some analog hygrometers must be hand calibrated periodically and react poorly to quick changes in weather. Analog hygrometers can be used to measure both indoor and outdoor temperatures and are durable, but only read the relative humidity with an accuracy of 10%RH. Below is an image of an analog hygrometer. 

Analog Hygrometer


2. Digital Hygrometers: Compared to analog hygrometers, digital hygrometers provide a more competitive and futuristic reading. Digital hygrometers use electric current monitors to read moisture levels. Digital hygrometers can range from simple indoor humidity readers to durable outdoor systems and can provide additional information such as the high and low humidity of the day as well as optimal comfort levels. The best part? No self-calibration required and an accuracy of 5%RH! In our case, our hygrometers have the most accurate sensor for the price range, providing accuracy of 2~3%RH. Below is the image of our digital hygrometer, the best seller on many online marketplaces. 

ThermoPro TP50 Digital Hygrometer

What does a hygrometer measure?


Hygrometers are valuable tools for many different reasons and use. If you are sick and have a dry cough, or have dry skin it may be because the air in your home or room is particularly dry. If you are wondering how to remedy these types of problems, you may need to invest in a humidifier in conjunction with using a hygrometer to read the comfort level of your home and then adjust the humidifier based on the readings the hygrometer is displaying. 

Hygrometers also make great additions to monitor the humidity for indoor plant care. Whether it be in a greenhouse or in a room in the house, most plants will flourish at a specific humidity, and the TP50 will enable you to accurately monitor your indoor garden and have your plants grow to their full potential.


Having an indoor area that is too dry is not always the problem, hygrometers are also handy tools when looking to measure if an area is too humid. Using your TP50 hygrometer to ensure that a room is not too wet will save you time, money and safety as damp rooms can often cause water damage or the growth of harmful molds and mildew.

ThermoPro TP-50


Having a hygrometer at your disposal can help in everyday situations, even if you are not purchasing for a specific use. The TP50 allows for accurate temperature AND humidity readings, as well as a comfort display system for optimal indoor comfort.
Be smart, safe and prepared for anything and pick up your TP50 today!

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