Water is an essential part of our everyday lives. Although we often use water without giving it much thought, there are times when keeping track of how much we use is extremely important. In times ...

There’s almost always more than one way to get any particular job done. Suppose for instance you have a tank you fill up from a well, and you’d like to know when the time is right to refill the tank.

Often, the only liquid level indicator you need is your eyes, such as when looking at your cold beverage on a summer’s day. Other times, though, it’s useful to have some kind of indicator light that ...