Level controller connected to a 1 inch diameter “level probe” only 1 inch in diameter.  Replenishes tank level due to evaporation automatically.  This is built on the same technology as our existing level controllers but uses a different float switch. The combination pictured is the LC3 level control box + LP1/3 level probe. 

The float switches are protected inside a durable guard which prevents the most common failure mechanism.  The level probe is adjustable by hand using a thumbscrew collar.

Youtube video here shows the level controller connected to a solenoid valve for D.I. water.