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GV-67 ISO 565, 3310-1 Calibration Screen Tray Verification is a service that upgrades Screen Trays from Compliance to ISO Calibration Grade. Calibration Grade Screen Trays have about twice as many openings measured as Inspection Grade Trays. The higher number of measured openings increases the confidence level to 99.73% that the standard deviation of these openings meets the maximum allowed by ISO. Calibration Grade Screen Trays should be used in applications where a very high degree of accuracy is required. Each Calibration Tray consists of a compliance tray with added Calibration Sieve Verification service. The calibration grade service is for ISO Testing Screen & Test-Master Trays in sizes ranging from 125.0mm to 38µm in ISO 565, or ISO Porta-Screen® Trays with opening sizes that range from 50.0mm to 38µm. Calibration Grade verification of new screen trays is available online from the drop-down menu at the time of order or by contacting Gilson Customer Service.
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