Monitoring ball Prism Ø 30 mm, glass prism Ø 17.5 mm
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Ball prism Ø 30mm, with triple glass prism Ø 17.5 mm.
Galvanised steel body with M6 female thread in back.
Weight 80 g.
Prism constant: Leica = +23.1 mm, Trimble etc. = -11.3 mm.