The Gen 2 EasyDens Digital Bluetooth Hydrometer is perfect for homebrewers and small commercial breweries. Whether you're at the start of the brewing process or during fermentation, it can help you accurately measure gravity and alcohol levels. You just need to take a 2 ml sample and use the free app on your phone or tablet to track everything. It's based on reliable technology and can even handle different temperatures. With dimensions of 120 mm × 80 mm × 35 mm (4.7 in × 3.1 in × 1.4 in) and weighing 200 g (7 ounces) including batteries, it's easy to carry around. The battery can last for over 40 hours, so you can use it worry - free. This hydrometer is a must - have for anyone serious about brewing great beer.