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Proportional caliper

ASTM D4791
General description
General description
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.
It consists of 6" x 16" (152.4 x 406.4mm) base plate with four rubber feet, 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.
Weight: 3.2 kg.
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Ordering info

Proportional caliper for aggregates to ASTM D4791