With the Jager thermostat and heater from Ehei,, you can help your aquarium maintain the perfect temperature. Equipped with precise control, simple recalibration and an easy-to-read control lamp, this top-tier thermometer helps you create a comfortable home for your finned family. Safely submerging in your tank, the Jager is built with an ultra-modern, unique design that encases the heating surface in laboratory glassâ€”which helps it keep your aquarium’s heat levels steady. It even has an automatic dry run shut-off, so you know your habitat is always safe, too! Whether you’re looking to heat a 20-liter tank or your expansive 1000-liter aquarium, there’s a range of sizes to choose from.