美国西特电子天平型号称量最小读数线性重复性称盘尺寸BL-120S120g0.001g 0.002 0.001 120mmBL-200S200g0.001g 0.002 0.001 120mmBL-310S310g0.001g 0.002 0.001 120mmBL-410S410g0.001g 0.002 0.001 120mmBL500S500g0.001g 0.002 0.001 120mmBL-1200S1200g0.01g 0.02 0.01 158mmBL-2000S2000g0.01g 0.02 0.01 158mmBL-3100S3100g0.01g 0.02 0.01 158mmBL-4100S4100g0.01g 0.02 0.01 158mmBL-5000S5000g0.01g 0.02 0.01 158mm