Proportional Caliper
Use for the rapid and easy determination of percentage of flat particles, elongated particles, or both in coarse aggregate fractions of 9.5mm (3/8 in) or larger.
Budget Caliper consists of 6" x 16" (152.4 x 406.4mm) base plate with four rubber feet for stability, two fixed posts and a 13in (330mm) pivoting arm. The positioning of the pivoting arm allows to obtain desired ratio among 1:2, 1:3, 1:4, or 1:5.
Four-Station Caliper is similar, but provides openings for all four ratios simultaneously, without the need to reposition the pivot screw. Manual testing can be performed more efficiently. Moveable posts are also replaceable.
Budget Caliper consists of 6" x 16" (152.4 x 406.4mm) base plate with four rubber feet for stability, two fixed posts and a 13in (330mm) pivoting arm. The positioning of the pivoting arm allows to obtain desired ratio among 1:2, 1:3, 1:4, or 1:5.
Four-Station Caliper is similar, but provides openings for all four ratios simultaneously, without the need to reposition the pivot screw. Manual testing can be performed more efficiently. Moveable posts are also replaceable.
ASTM D4791, BS 812:105-1
