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 By adding a wedge and with partial refractive coating on surfaces S1, it can be used as a beamsplitter. It is often used in Plumb Level, Surveying, Alignment, Rangefinding and Optical Tooling.

Specification for standard Beamsplitter penta prism:
Material:  BK7 Grade A optical glass
Dimension Tolerance: +0,-0.2mm
Flatness: λ/4 @ 632.8 nm
Surface Quality:  60-40 scratch and dig
Clear Aperture: >80%
Bevel: 0.2 mm to 0.5 mm x 45
Beamsplitter Ratio Transmission/Reflection@ 630-680nm, T/R: 20/80 ±5