A hygrometer is an instrument that is used to measure the humidity or moisture content in the air. These devices can be used either indoors or outdoors and gather data about the moisture content exclusively.

Relative humidity of the air is usually expressed in a percentage and is measured on a scale of 0 to 100, the higher number corresponds to higher moisture content in the air.

ThermoPro TP50 Hygrometer Review

Built by ThermoPro a trusted brand in the measurement business, they have built a quality hygrometer in the TP50. It is easy to use and easy to read.

I like the function that shows visually with a little smiley face, whether the humidity is dry, comfortable, or wet. This unit is wireless and uses 1 AAA battery (which is included).

The mounting hardware on the back is magnetic so you can stick it in many handy places.

I love the 5 year warranty that is included. You know a company trusts its products when it has a long warranty like that!

AcuRite 00613 Indoor Humidity Monitor Review

This features a magnetic mount and a fold-out stand for added usability and you can place it according to your convenience.

Simple and easy to use, you can use this hygrometer to control the humidity level in your house.

Powered by AA alkaline batteries, this will prove to be an important and functional addition.

Caliber 4R Gold Digital/Analog Hygrometer Review

This beautifully designed hygrometer by Caliber is both analog and digital and makes humidity monitoring a breeze.

Accuracy is guaranteed to within one degree, which is great. This hygrometer works great for cigar humidors.

Quality Importers HygroSet II Round Digital Hygrometer for Humidors Review

This handy little digital hygrometer is designed for humidors but also designed to be easy to use.

This model is easy to calibrate, and is one of the few models that allows you to adjust the display after calibration.

The numbers could be easier to read, but overall this model is still very easy to operate.

Buying Guide – How to find the best hygrometer for your needs.

There are 2 types of hygrometers: Resistive and Capacitive.

How Do They Work? Compact and accurate, these modern hygrometers can be placed anywhere for precise measurement of the humidity. Most of the modern hygrometers use electronic sensors that are much more accurate than their traditional counterparts.

The resistive hygrometers use polymer membranes that record changes in the conductivity when water or moisture is absorbed. On the other hand, the capacitive hygrometers measure the moisture content by recording changes in the water present in the air by using electrical signals between 2 plates.

What’s the Fuss About? The hygrometers have found its applications in many industries. From weather forecasting to museums, these devices are used almost everywhere. Meteorologists use the hygrometer for daily weather reporting and in domestic uses, hygrometers are used to know the humidity level at your house and adjust the dehumidifier accordingly when it gets too stuffy.

For museums, it is pivotal to maintain the right temperature and humidity to preserve the documents, books, artifacts and more.

Here’s How to Buy Them: If you are planning to buy a hygrometer, here’s what you should be looking at.

Accuracy and Speed of Response: Most hand-held hygrometers are affordable and are 3 to 5% accurate and takes 10 to 15 minutes to accurately record the humidity level.

Humidity sensors are usually not durable and it is advisable to buy sensors with a replaceable probe. If you are using hygrometer in critical fields, say in a museum, it is important to have a spare probe handy so that you don’t have to send the entire unit to the servicemen.

Simplicity: Use a hygrometer that is simple to operate and understand. The symbols and features should be understood by a layman.

Storing Data: This depends upon your applications from the hygrometer. If you are using it for a high-grade commercial application, you should select the one that can log data over time that can be downloaded later.

Technology: The newest addition to the family of hygrometer is the wireless hygrometer that can measure the humidity level quickly since they are in equilibrium with temperature and humidity.