Hygrometer

A hygrometer is a measuring instrument used to monitor relative humidity (RH) levels inside a humidor. Since cigars must be stored between 65% and 70% humidity to retain their flavor and integrity, a reliable hygrometer is a critical component of any cigar storage setup.

Digital and analog hygrometers
Image on left by Jacek Halicki / CC BY-SA 4.0 - Wikimedia Commons
Image on right by Daniel FR / CC0 1.0 - Wikimedia Commons

Why a Hygrometer Matters

Cigars are made of natural, fermented tobacco leaves that respond to ambient moisture. Without proper monitoring, cigars can:

  • Dry out (causing cracks, fast burns, and harsh smoke)
  • Absorb too much moisture (leading to mold or uneven burn)
  • Experience flavor degradation due to fluctuating conditions

A hygrometer helps cigar enthusiasts actively manage humidor conditions and adjust humidification as needed.

Citation: Cigar Aficionado – Cigar Storage Guide

Types of Hygrometers

Type Description Pros Cons
Analog Traditional dial display with mechanical coil movement Classic look, no batteries needed Less precise, requires calibration
Digital Electronic display with sensors More accurate, displays temp & RH Needs batteries, may cost more
Wireless/Smart Connects to apps or cloud storage Remote monitoring, trend tracking More expensive

Digital hygrometers are preferred by most modern cigar collectors due to their accuracy and ease of use.

How to Calibrate a Hygrometer

Calibration ensures the hygrometer reads humidity levels accurately.

Salt Test Method:

  1. Place 1 teaspoon of table salt in a small container
  2. Add a few drops of distilled water (enough to moisten, not dissolve)
  3. Seal salt and hygrometer in an airtight bag or Tupperware
  4. After 6–8 hours, it should read exactly 75% RH
  5. Adjust if needed, or note the variance for reference

Citation: Famous Smoke – How to Calibrate a Hygrometer

Hygrometer Placement

  • Should be placed at cigar level, not the lid or floor of the humidor
  • In larger humidors, consider using multiple hygrometers to account for humidity variation
  • Avoid placement near the humidification source to prevent skewed readings

Tips for Maintaining Accuracy

  • Calibrate quarterly for best results
  • Use distilled water or propylene glycol to reduce fluctuation
  • Replace batteries in digital models every 6–12 months
  • Store the humidor away from direct sunlight or heat sources

Related Glossary Entries

Summary

A hygrometer is essential for anyone who wants to protect their cigar investment. It allows you to track humidity levels with accuracy and take corrective action before your cigars are compromised. Whether analog or digital, reliable humidity monitoring is the foundation of proper cigar care.