Bidirectional water pump, ultrasone distance sensor, fluorescent tube lighting with electronic starters, controller and relays.
We provided (and installed) the electronics for this project. A press on a pushbutton switch starts pumping water into an acrylic tube. At several levels, a display switches on, with a depiction that is characteristic for that water level. The level in the tube is monitored by an ultrasone sensor. A controller drives the set of equipment.
The finished console
Detail image, showing the water pumped into a clear acrylic tube