Liquid systems all have their own specialty aspects and their own peculiarities. The liquids vary in density and viscosity (flow level) ranging from water with a centipoise of one to liquid epoxies having up to 10,000 centipoise. Some liquid environments, flour-inert 3-M liquids for example, can have very wide temperature ranges that vary from -40°C to 200°C. Also, water under high pressure can become super heated. Meeting these extremes is no easy matter, however, the reed switch level sensors get the job done.