How to Calibrate a Digital Hygrometer

Old-fashioned, analog hygrometer

A hygrometer measures relative humidity. Hygrometers are commonly used when storing cigars in a humidor. It is essential that the hygrometer is accurate because if the reading is off by as little 5 percent, your cigar collection could be ruined. Digital hygrometers are more accurate than the traditional analog hygrometers, but they still need fine tuning from time to time. Calibrating your hygrometer is necessary to ensure proper performance.

Things You'll Need

• Milk bottle cap
• 1 tsp. salt
• Plastic zipper bag

Instructions

1. Fill a milk bottle cap with 1 tsp. salt and a few drops of water. Use just enough water to moisten the salt.

2. Put the cap and hygrometer inside a plastic zipper bag and close the bag.

3. Read the hygrometer after waiting at least 12 hours. If the reading is 75 percent, your hygrometer is accurate. If it is not, turn the screw or dial on the back of the hygrometer until it reads 75 percent.

References

• Cigarmony: Calibrating Hygrometers