The Density Units Converter, developed by N. G. Tech, is a free Android application that allows users to easily convert between twelve different density units. The units include grams per milliliter, kilograms per cubic meter, kilograms per liter, ounces per cubic foot, ounces per cubic inch, ounces per imperial gallon, ounces per US gallon, pounds per cubic foot, pounds per cubic inch, pounds per imperial gallon, pounds per US gallon, and slugs per cubic foot.

Using the app is simple: the user inputs the amount they want to convert and selects the desired units. The calculator then displays the equivalent amount in the other eleven units. Additionally, the user can choose the number of decimal points they want to display.

Overall, the Density Units Converter is a great tool for engineers, scientists, and students alike. It is easy to use and provides accurate and reliable conversions.