測定土工布的孔徑,性能符合GB/T14799-93。YG992-4型土工布孔徑測定儀主要技術參數:1、篩子直徑 Diameter of sieve 200mm2、標準顆粒(mm):0.05~0.071(320m),0.071~0.09(240m), 0.09~0.125(180m),0.125~0.154(150m), 0.154~0.18(120m),0.18~0.25(80m), 0.25~0.28(60m),0.28~0.35(46m),0.35~0.45(36m)3、搖振次數 Shake tim