The Extech RHM15 Hygro Thermometer is designed for monitoring temperature and humidity conditions in enclosed or open space environments. It helps gauge proper heat and moisture levels for a variety of applications, from protecting valuable items to ensuring workplace comfort. The instrument simultaneously displays both temperature and humidity on its clear LCD.

Built-in memory stores maximum and minimum readings, allowing users to track extremes over time. A clear button conveniently resets the max/min measurements. The temperature range covers 14 to 140°F (-10 to 60°C) with ±2°F accuracy, while humidity covers 10% to 99% RH with ±5% RH accuracy.

The RHM15 includes a built-in tilt stand for easy placement on desks or shelves. A low battery indicator alerts when the LR44 battery needs replacement. Its versatility makes it suitable for diverse applications including musical instrument cases (protecting wood from cracking), humidors (maintaining proper cigar humidity), retail display cases, memorabilia collections, factories, greenhouses, offices, and homes.