Wet and Dry Bulb Hygrometer

A. Product Overview

The wet and dry bulb hygrometer is designed for general humidity monitoring and outdoor use in a screen. It consists of two undivided thermometers mounted on a printed plastic scale, allowing clear temperature reading. A slide pointer positioned between the two thermometers helps you read relative humidity easily without complex calculation.

The scale is housed in a protective plastic case that also includes a water reservoir with an anti-frost device, supporting stable wet bulb operation in typical outdoor conditions. Its easy-to-read layout makes it suitable for routine checks where simple, quick humidity indication is needed.

B. Working Principle

This instrument works on the wet bulb and dry bulb method.

• The dry bulb thermometer measures the actual air temperature.

• The wet bulb thermometer measures a lower temperature because evaporation cools the wetted sensor.

• The difference between dry bulb and wet bulb temperatures relates to the moisture content of air.

• The built-in slide pointer uses this temperature difference to indicate relative humidity directly on the scale, so you can read humidity easily.

The reservoir supplies water to keep the wet bulb condition active, and the anti-frost device supports operation in conditions where frosting could affect the wet bulb performance.

C. Why It Is Used

Wet and dry bulb hygrometers are used for quick and practical relative humidity checks in outdoor and general environments. They are useful when you want a straightforward humidity indication without electronic sensors.

Common reasons to use it include:

• Basic monitoring of outdoor humidity conditions when installed in a screen

• Routine environmental checks where a simple visual reading is preferred

• Situations where a non-electronic solution is needed for general humidity indication

D. Suitable Buyers

• Weather and environment monitoring users who install instruments outdoors in a screen

• Educational institutes and training labs demonstrating humidity measurement principles

• HVAC and facility teams needing a quick humidity check method for general reference

• Greenhouse and agricultural users monitoring ambient humidity trends

• Maintenance teams who prefer a simple instrument that is easy to read and maintain

FAQ

1) What is a wet and dry bulb hygrometer used for?
It is used to estimate relative humidity by comparing wet bulb and dry bulb temperatures.

2) How does it show relative humidity without electronics?
It uses two thermometers and a slide pointer that converts the temperature difference into a relative humidity reading on the scale.

3) Where should I use it for best results?
It is intended for outdoor use in a screen to reduce direct sun and external exposure effects.

4) What are the two thermometers on the scale?
One is the dry bulb thermometer for air temperature and the other is the wet bulb thermometer that reads lower due to evaporation cooling.

5) What is the slide pointer for?
The slide pointer helps you read relative humidity easily between the two thermometer readings.

6) What is the reservoir and why is it needed?
The reservoir holds water needed to keep the wet bulb condition active so the instrument can indicate humidity correctly.

7) What does the anti-frost device do?
It helps reduce issues caused by frosting that can affect the wet bulb reading in colder conditions.

8) Is this hygrometer suitable for general use?
Yes, it is designed for general humidity monitoring and easy visual reading.