Several years ago, John Eldredge Sr., the owner of Eldredge Equipment Services, and his son, John Jr., were growing increasingly frustrated with the technology on the market for determining depth in tanks of their fleet of vacuum trucks. So the pair took matters into their own hands, developing the Depth Ray liquid level monitoring and control system. The duo used the 2014 Pumper & Cleaner Environmental Expo International, the company’s first as a stand-alone exhibitor, to introduce the second generation model of the unit.“We just needed a solution that would work for us,” says John Jr. “We’d used rods and
