比例卡尺装置

用于测定扁平颗粒的百分比, 细长颗粒, 或在粗聚集体中既扁平又拉长的颗粒. 钢结构的强度和耐久性，镀为耐腐蚀. 6" x 16" (152.4 x 406.4mm)底板，四个橡胶脚的稳定性，并方便在桌面测试. Ratio desired is obtained by selecting one of four adjustable positions: 2 = 1:2; 3 = 1:3; 4 = 1:4; or 5 = 1:5. 建议在进行测试之前仔细检查所需的程序.