Humidity Meters

A humidity meter is designed to measure the amount of moisture or water vapour in the air, commonly called humidity. It provides readings that help individuals assess and manage moisture levels in indoor and outdoor environments. Humidity meters come in various forms, including analogue and digital, with each type offering unique features and levels of accuracy.

One of the primary functions of a humidity meter is to monitor relative humidity (RH), which is the ratio of the amount of moisture in the air to the maximum amount it can hold at a specific temperature. Understanding RH is essential for numerous applications, such as climate control in buildings, storage of perishable goods, and maintaining optimal conditions for processes like manufacturing and research.

How Do Humidity Meters Work?

Humidity meters employ different technologies and mechanisms to measure humidity accurately. One common method involves using a hygrometer, which typically consists of a sensor that responds to changes in moisture levels. The sensor may utilise various principles to detect humidity variations, including capacitance, resistance, or thermal conductivity.

Capacitive humidity sensors, for instance, rely on the electrical capacitance changes caused by the absorption or desorption of water vapour on a thin film. As humidity increases, the film absorbs moisture, leading to a change in capacitance that the sensor detects and converts into a humidity reading. This process allows capacitive humidity meters to provide precise and fast measurements, making them popular for many applications.

How Accurate Are Humidity Meters?

The accuracy of humidity meters can vary depending on sensor type, calibration, and environmental conditions. While modern digital humidity meters offer high accuracy levels, it's essential to understand their limitations and potential sources of error.

One factor affecting accuracy is sensor drift, where the sensor's performance may change over time due to ageing or exposure to contaminants. Environmental factors such as temperature fluctuations and air currents can influence humidity meter readings, especially in uncontrolled or dynamic settings.

To ensure reliable measurements, selecting humidity meters with appropriate calibration and accuracy specifications for the intended application is crucial. Regular calibration and maintenance also play a vital role in preserving accuracy and prolonging the lifespan of these devices.

How to Calibrate a Humidity Meter?

Calibration is critical for verifying and adjusting the accuracy of humidity meters to ensure reliable measurements. While some humidity meters come pre-calibrated from the manufacturer, periodic calibration checks are still necessary, especially in critical applications where precise humidity control is essential.

The calibration procedure typically involves comparing the humidity meter readings against reference standards or known humidity levels. This can be done using specialised calibration equipment or calibration chambers with precisely controlled humidity and temperature conditions. Users can improve the accuracy and maintain measurement integrity by adjusting the humidity meter's settings or applying correction factors based on calibration results.

Regular calibration intervals vary depending on usage frequency, environmental conditions, and industry regulations. It's essential to follow manufacturer recommendations and industry best practices to ensure proper calibration and compliance with quality standards.

Industry Superstore Humidity Meters


Industry Superstore has been selling humidity meters for several years. Industry superstore provides these devices for various industries. Don't hesitate to contact us with any questions about our humidity meters or other products.


Other Products


IndustrySuperstore customers can rely on us for high-quality products. Humidity Meters are only a handful of the products we provide customers across the United Kingdom. We are also a significant supplier of Voltage Testers.