About This

• 【Effortless Setup with Intuitive Dial Control】WILLHI WH2603 Humidity Controller simplifies settings with two knobs for ON/OFF humidity adjustments—no complicated menus, no digital programming. It provides precise control across the full 1%RH to 100%RH range with ±3%RH accuracy, making it an ideal Digital Humidity Controller for various applications. Settings stay saved during power outages. No reset needed. Save time and hassle.
• 【Simple Controls, Smart Design】Turn the knobs to set your desired humidity range. Toggle between humidifying and dehumidifying modes with a single switch—instant mode change, no menu diving. Press either side button to adjust screen brightness to your liking.
• 【Versatile Applications】 Designed for mushroom growing, greenhouses, reptile terrariums, livestock coops, fermentation, and DIY incubation. Also ideal for seed starting, curing meats, cheese aging, and exotic plant propagation. Hangs easily in grow tents, racks, or on walls. One Humidity Control Switch replaces multiple devices—whether you need a Grow Tent Humidistat or a Greenhouse Humidity Controller, it delivers precise moisture management across all your projects.
• 【Robust and Safe Construction】 Built to last. Fire-retardant ABS shell, surge-protected with a resettable fuse, and a relay rated for 100,000 cycles. ETL-certified cord for added safety. The housing is not waterproof; please keep it dry. Operating temperature: -40°F to 176°F (-40°C to 80°C). WARNING: TYPE 1 ACTION – CONTROL ONLY, NOT A SAFETY DEVICE. Humidifying or dehumidifying equipment must have its own protection.
• 【Compact Power for Tight Spaces】 Rated for 1200W (120V, 10A Max) . This Plug & Play Humidity Controller handles large dehumidifiers, foggers, exhaust fans, and misting systems. Compact design hangs on tent poles, walls, or shelving to free up floor space in crowded grow tents and greenhouses. Package contains 1x WH2603 humidity controller, 1x sensor probe and 1x user manual.