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W125 — Metrology Wells Versus Dry-Wells - Do vertical gradients really matter?

Dry-well calibrators are widely used as temperature standards in many calibration laboratories and in various industrial fields. It’s well known that the axial temperature uniformity of a dry-well calibrator is generally worse (usually much worse) than that of a liquid bath. How much do these vertical temperature gradients really affect your calibration? Why would you consider Metrology Wells as an alternative to both dry-wells and fluid baths?