Extech-445815-Humidity-Alert-II-Hygro-Thermometer-Extech-445815-P-Damage-resulting-from-high-humidity-&-poor-ventilation-in-storage-rooms-offices-&-houses-not-only-costs-money-to-repair-but-is-also-unhealthy-&-unsightly-Most-people-think-that-the-dampness-comes-from-outside-but-that-is-often-not-true-In-reality-moisture-is-caused-inside-the-house-by-evaporation-in-the-kitchen-&-bathroom-The-use-of-highly-insulating-building-materials-greatly-reduces-ventilation-which-means-th