Electronics-Mobile phones & digital products's customers have bought 16 kinds of detection instruments here
Level 1:
Statement: The following testing instruments are based on the customer's purchase behavior, not officially recommended, only for reference!
Genuinegoods
Leneta 2A sealed Opacity Chart
Japan OSP-25/250 Wet Film Applicator WFT 25μm Length 250mm
UK RK KHC.21 Drawdown Plate for Better Repeatability and Proofing