GE, Frigidaire, Whirlpool, and Amana are what is mostly used in apartments, cus they’re cheap. I believe lower end Frigidaires still just use a float to keep it from over filling. GE dishwashers have had sensors for the last several years, before that they just had a float to keep it from over filling. Whirlpool/Amana just changed their design to a sensor about a year ago. Before that, the lower end models just had a float to keep it from over filling. The mid range to higher end models didn’t have a water level sensor, but they did have an optical/flow sensor. And if it didn’t see water flow while the dishwasher was running, it would register an error code, but that didn’t always work. Samsung and possibly LG are the only really popular ones in the US I can think of that have had water level sensors on all their models for a long time.