用途：線密度光柵，通過折射光可快速確定針織或機織物每厘米或每英寸內的紗線根數。 貨號Models TNG57A 堅韌彈性塑料材質,分成三組 Tenacious flexible plastic material 3 groups Model AA, Range 100-170 lines/inch Model AC, Range 20-90 lines/inch Model AB, Range 50-120 lines/inch TNG57B 透明玻璃材質, 分成五組 Transparent glass material 5 groups Model BA, Range 30-120 lines/inch Model BD, Range 50-140 lines/inch Model BB, Range 90-170 lines/inch Model BE, Range 120-190 lines/inch Model BC, Range 170-240 lines/inch