BESTO provides Working and Reference Master Gages per API Specification 5B. All Working gages are manufactured and calibrated against an API certified Reference Master Gage, up to 20 inches in diameter. BESTO is the industry leader in quality, capability and inventory of API 5B gages. All the gages come with the calibration certificates traceable, and availiable for audit.
API Spec5B Working Gages
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