FEATURES:

• 6 copper-coated prisms bonded together
• 5-second accuracy or less than 2-second accuracy
• Metal core with rubber bumpers on the top and bottom to keep the prism safe
• Large size (B31023) equipped with 5/8”-11 thread stud on the top, and push button for quick release
• Medium size (B31024 ) equipped with 5/8”-11 adapters both top and bottom, and the center focus of all 6 prisms is kept at the same level
• Small (B31025) equipped with M8 universal mounting thread, used with prism poles (B63303/B63303B)