IGR.PARETE 70 Wall-Mounted Hair Hygrometer – Complete Technical Data Sheet
📦 Product information
Item code: WALL HYGIENE 70
Italian name: Wall mounted hair hygrometer
English name: Hair Hygrometer / Wall Hygrometer
Type: Analog humidity control instrument
Compatibility: FIEM MG and Astrale series (pre-drilled holes)
💡 PRACTICAL ACCESSORY: The hair hygrometer is particularly suitable for incubators without a wet bulb hygrometer. It is inserted directly inside the incubator, visible from the outside.
🔍 What is a hair hygrometer?
The hair hygrometer is an analog instrument that measures relative humidity using the hygroscopic property of hair (natural or synthetic). Human hair, exposed to relative humidity between 2.5% and 100%, stretches proportionally to the increase in humidity.
Operating principle:
- A bundle of hair (natural or synthetic) is secured at one end
- The other end is connected to a mechanical lever system
- As humidity increases, hair grows longer.
- Levers transmit movement to a hand
- The hand indicates the %RH value on the graduated scale
This principle was perfected in 1783 by the Swiss scientist Horace-Bénédict de Saussure and remains one of the simplest and most economical methods for measuring humidity today.
⚙ Technical features
| Characteristic |
Value |
| Measurement type |
Hair (natural or synthetic) |
| Typical accuracy |
±3-5% RH (range 20-85%) |
| Humidity range |
0% - 100% RH |
| Temperature range |
-35°C to +65°C |
| Graduated scale |
Dial with %RH hand |
| Diet |
None (mechanical analog) |
| Assembly |
Wall-mounted - MG/Astrale series holes |
📊 Detailed Comparison: Hair vs. Wet Bulb
| Characteristic |
Hair Hygrometer |
Wet Bulb Hygrometer |
| Precision |
±5-10% RH (basic models)
±3% RH (quality models) |
±3% RH |
| Speed of response |
Slow (5-25 minutes) |
Average (few minutes) |
| Calibration |
Requires periodic calibration |
Factory, stable over time |
| Maintenance |
Minimum (periodic cleaning) |
Change of socks, water |
| Installation |
Simple (insert into hole) |
Positioning + water |
| Diet |
None |
None |
| Incubation specificity |
Generic (all environments) |
Calibrated for 37.8°C |
| Wear and tear |
Hair degrades over time |
Only sock to be replaced |
| Price |
€24.20 |
€24.50 |
✅ Advantages of a hair hygrometer
- It works without electronics: No power or batteries required
- Instant installation: It fits into the MG/Astrale pre-drilled holes
- No water maintenance: No need to fill tanks or change socks
- Robust: Also suitable for less than perfect conditions
- Continue reading: Always visible without having to open the incubator
- Quality models: Accuracy ±3% RH in the 20-85% range
❌ Disadvantages of professional incubation
- Slower reaction speed: A 15% change takes 5-25 minutes to register
- Calibration sensitivity: If the hair is worn, dirty or not regenerated, the readings become inaccurate.
- Variable accuracy: Errors of 5-10% in basic models, especially below 20% and above 85% RH
- Non-specific for incubation: Designed for general environments, not calibrated to 37.8°C
- Nonlinearity: Hair length variation is not proportional to humidity
- Degradation over time: The hair loses elasticity and precision
- Extreme temperatures: Does not work below -30°C (fiber freezing)
🏆 Which one to choose?
Choose the HAIR hygrometer if:
- Do you want a simple and immediate visual check?
- Your incubator has pre-drilled holes (MG/Astrale series)
- You don't want to deal with maintenance (water, socks)
- You need it as a complementary indicator, not as the main reference
Choose the WET BULB hygrometer if:
- You want the highest possible accuracy (±3% RH)
- You need an instrument calibrated for 37.8°C (incubation temperature)
- You need to check the accuracy of the digital sensors
- Manage professional incubations where humidity is critical
🔧 Installation
Simple procedure
- Place the hygrometer in the incubator in a place visible from the outside.
- Wait 30-60 minutes for the reading to stabilize
💡 Tip: To check the calibration, you can use the saturated salt method. Place the hygrometer in a closed container with moist table salt: after 24 hours, it should indicate about 75% RH.
🔧 Maintenance
🔧 Calibration procedure (saturated salt method)
To check the accuracy of your hair hygrometer, follow this recommended procedure:
Necessary material
-
-
- Airtight container (glass jar with lid or food storage container)
- Regular table salt
- A few drops of water
- Stand or grid to lift the hygrometer
Step-by-step procedure
- Prepare the airtight container: Glass jar with lid or tightly sealed food container
- Prepare the wet salt: Put table salt in a small cup and add a few drops of water until you get a "mush" (do not add excess water)
- Place the hygrometer: Lift it off the salt using a rack or stand - it should NOT touch the salt or water.
- Seal tightly the container
- Please wait as long as necessary: For hair hygrometers you need 18-24 hours
- Read the value: The humidity inside the jar must be 75% RH ± 2%
📌 How to interpret the reading
-
-
- 73-77% RH: Perfect, hygrometer calibrated correctly
- 70-80% RH: Acceptable for hair hygrometers (they are not ultra accurate)
- Error ±10%: It needs to be adjusted if it has a calibration screw
- Top error: Old/dirty/dry hair → regenerate it or replace the hygrometer
🆘 Common errors that distort calibration
- Salt too wet: Creates 100% RH instead of 75%
- Non-airtight container: External humidity affects the reading
- Changing temperature: Maintain stable temperature during the test
- Hygrometer touching salt: He must remain relieved
- Hair that has not been regenerated for years: It loses elasticity and precision
✔ Advice from 45 years of experience
Hair hygrometers are reliable, but:
-
-
- They react slowly to changes
- After years they become "lazy" with major mistakes
- The high temperatures of the incubator stress them
Use them as a complementary periodic check, not as the primary tool. For accurate reference measurements, we recommend the wet bulb hygrometer calibrated to 37.8°C.
- Cleaning: Periodically clean the dial with a soft, dry cloth
- Calibration: Check with salt method every 6-12 months
- Hair regeneration: If readings are inaccurate, expose to steam for a few minutes
- Avoid: Direct water splashes, excessive dust, impacts
🛒 Commercial information
Price: €24.20 (VAT excluded, shipping excluded)
Compatibility: FIEM MG and Astrale series (pre-drilled holes)
FIEM WAREHOUSE COMO – Padovan Avicoltura: original accessories for incubation.
💡 Related products
- Wet Bulb Hygrometer HNB (€24.50) – For precision control
- HNB-K Replacement Socks (price to be verified) – For wet bulb hygrometer
- Analog thermometer °F (0.5/A) (€22.05) – Temperature control
- Prismatic Hygrometer °F F58 (price to be verified) – Other model available
📦 Logistics and times
- Shipping: 1 working day
- Delivery: 2-4 business days
- Departure: FIEM Como Warehouse
- Packaging: Protected for precision instruments
✅ Guarantee
❓ Frequently Asked Questions (FAQ)
Q: Will this fit my MG70 incubator?
A: Yes, it is designed to fit the MG (50/70/100/140/200/244/316) and Astrale series bores.
Q: Is it more accurate than the wet bulb hygrometer?
A: No, the hair hygrometer is accurate to ±5% typical (±3% in better models), while the wet bulb is accurate to ±3% and is specifically calibrated to 37.8°C.
Q: Do I need to calibrate it before use?
A: It is advisable to check the calibration using the saturated salt method (it should indicate ~75% RH).
Q: How long does a hair hygrometer last?
A: With correct use, several years, but the hair loses elasticity over time and precision decreases.
Q: Can I use this as my only humidity monitoring tool?
A: Yes, it's a practical solution for incubators without a built-in hygrometer. For professional monitoring, we also recommend a wet-bulb hygrometer as a reference.
📞 Need help?
📋 Legal Notice and Rights
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PLAGIARISM PROHIBITED: Any reproduction of this text or data on other websites, whether in whole or in part, is strictly prohibited and will be prosecuted (DMCA and Law 633/41) without notice.
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