Glass fiber optic LLE 18/30-2,3-2,0-Z1, Glass fiber optic - thru-beam with metal silicone covering, Photoelectric Sensor Accessories, Chemical-resistant, Thread M6, Detect up to five level limits with one probe, Flexible instrumentation, No moving parts in the tank, No calibration: quick and low-cost start up, Two-point control and additional maximum and minimum detection