What’s cool about this Mini Hygrometer-Thermometer? It’s sensitive, accurate and quick-responding enough to put a useful number against immediate ambient conditions in real-time. The humidity percentage is particularly cool. As you ride closer to rain, the percentage of moisture in the air steadily increases. (Not raining yet, but you are riding closer and closer.) This instrument lets you predict not only the weather many miles ahead, but when air is hot and dry you’ll also know exactly how desiccating it is. You might not think this is interesting, but turns out it is. Lastly, it’s small and easy put anywhere, too.