STAUFF visual level gauges type SNA in different versions and 7 nominal sizes for optical fluid level measuring in hydraulic tanks, containers and resers with a maximum preload pressure of 2 bar. For attaching to the outer side wall of the hydraulic tank. Housing made of Steel St 12, black powder-coated. Sight tube and plugs made of Polyamide (PA). Seals made of NBR or FKM/FPM. Alternative sealing materials available on request. Scale plate made of PVC. IP 65 protection rating: Dust tight and protected against water jets.