技术参数：
型号          zei大称量值/可读性
XP2U          2.1g/0.1ug
XP6           6.1g/1ug
XS3DU         0~800mg/1ug,0~3.1g/10ug
XP26          22g/1ug
XP26DR        5.1g/2ug,22g/0.01mg
XP56          52g/1ug
XP56DR        11g/2ug,52g/0.01mg