Do you know how full your holding tank is? Not knowing can be a problem and an embarrassment–just as bad or worse than not knowing how much water and fuel you have left. The all new Gobius Tank Level Indicator will measure the contents of all of your tanks cleanly and easily, no matter what material your tanks are made of–aluminum, fiberglass, plastic or stainless steel. Gobius measures your tank’s contents from the outside of the tank. There are no holes to drill at installation and no need to clean the inside of the tank. You calibrate the tank yourself. Only one button controls all features of the Gobius. It is easy to install and easier to use. For more information or to order call 800-801-8922 or visit us at www.AB-Marine.com.