SECO Mini Bob Prism

• Used with a plumb bob and Gammon Reel for speed and convenience
• Features a water-resistant, hermetically sealed, nitrogen filled prism canister that prevents fogging
• Has an adjustable offset of 0/-30mm
• Prism Diameter is 25.4 mm (1 in)
• Weighs 0.12 lb (0.05 kg)