Floating chlorine dispenser with built-in thermometer. You can spend less time working and more time swimming. This device simply floats in the water and slowly releases chlorine into the pool for you. It accepts up to 3in. chlorine tablets and also accepts 1in. tablets as well, so you can just load it, set it, and forget it as it sanitizes your pool. Wonder how warm or cold the water is? Just glance at the thermometer and you'll get an accurate and constant reading in both F° and C°.