Key Features
- Sensitive hair element for accurate humidity response
- Large, clear dial with 10% increments
- Fully mechanical – no power supply needed
- Corrosion-resistant ABS housing
- Easy wall-mounting for bridge, lab, or control room
- Ships with calibration certificate
Technical Specifications
| Specification | Value |
|---|---|
| Measurement Range | 0–100% Relative Humidity |
| Accuracy | ±2% RH (at 20°C) |
| Dial Diameter | 120 mm |
| Operating Temperature | -10°C to +50°C |
| Housing Material | Corrosion-resistant ABS |
| Mounting | Wall mount with flange |
| Dimensions | 140 × 140 × 35 mm |
| Weight | Approx. 200 g |
Frequently Asked Questions
How does a hair hygrometer work?
A bundle of human hair is attached to a mechanical linkage. As the relative humidity increases or decreases, the hair changes length, causing the dial needle to move and display the current moisture level.
Do I need to calibrate the hygrometer?
Yes. For continued accuracy, periodic calibration is recommended using a known humidity source or a wet/dry bulb kit, especially after prolonged exposure to extreme conditions.
Can I install it outdoors on the deck?
While built for marine environments, this instrument is designed for indoor or sheltered locations like the bridge, chart room, or laboratory. Keep it away from direct spray, rain, and sunlight to ensure reliable readings.
Why choose a mechanical hair hygrometer over a digital one?
A mechanical hair hygrometer does not require batteries or electrical power, making it inherently reliable in harsh marine conditions. It is also less susceptible to electronic interference and is simple to maintain at sea.
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