Mason’s Hygrometer – Humidity Measurement | Red Liquid, Mercury-Free

The Mason’s hygrometer is a reliable and educational instrument used to measure relative humidity by comparing wet-bulb and dry-bulb temperatures.

The instrument consists of two thermometers:

• one bulb is kept constantly wet by a siphon reservoir,

• the other provides a dry-bulb temperature reading.

Relative humidity is determined by comparing the two temperature readings using the included reference chart, offering a simple, visual, and accurate method of measurement.

Unlike traditional models, the Mason’s hygrometer uses a safe, easy-to-read red liquid instead of mercury, making it safer and more environmentally friendly.

⭐ Key Features

✔ Classic and proven humidity measurement method
✔ Red liquid for clear, easy reading
✔ Mercury-free for safer use
✔ Ideal for education, laboratories, and demonstrations
✔ No electronics required

🌡️ Temperature Scales

• –10 to 50 °C

• 10 to 120 °F

A durable, accurate, and instructional hygrometer, perfect for schools, laboratories, meteorology demonstrations, and scientific learning environments.