Calibratech Co.,Ltd. บริการสอบเทียบ ... · 2018. 4. 17. · JIS B 7420 : 1997 1. (via) 15 2.3 urn 2.5 um 2.7 um 2.8 um 3.1 urn 3.3 um 3.7 urn 4.0 urn 4.2