What Is Calibration?

Calibration vs. Verification Explained

Article By Global Instruments

Aspect	Calibration	Verification
Purpose	Determines how much an instrument deviates from a reference standard	Determines whether an instrument's performance falls within an acceptable limit
Output	Quantitative data: measured values, deviations, and measurement uncertainty	A qualitative pass/fail or conform/non-conform decision
Traceability	Always required, back to SI units through an unbroken chain	Relies on the traceability already established during calibration
Standard referenced	VIM 2.39; ISO/IEC 17025	VIM 2.44; product- or industry-specific standards (e.g., ASTM E4, ISO 7500-1)
Changes the instrument?	No — calibration is measurement-only	No — verification is also a check, not a correction
Typical document produced	Calibration certificate with as-found/as-left data	Verification report or pass/fail statement
Relationship	The underlying measurement activity	A downstream conformity assessment that depends on calibration data

In any laboratory, factory floor, or quality-controlled process, the accuracy of a measurement can matter as much as the measurement itself. A thermometer that reads two degrees high, a scale that drifts under

Converting Between Metric and Non-Metric Units:

 A Quick-Reference Guide for Chemists

Article By Global Instruments

Introduction: Why Chemists Still Need Both Systems

Chemistry, as a discipline, lives almost entirely within the metric system — more precisely, within the

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The Foolproof Method for Unit Conversion

Article By Global Instruments

Introduction: The Problem Every Student and Professional Faces

Dimensional Analysis 101:

The Foolproof Method for Unit Conversion

Article By Global Instruments

Every year, students and even seasoned professionals lose marks, money, or missions to a single kind of mistake: getting units wrong. NASA's Mars Climate Orbiter, a $327 million spacecraft, disintegrated in

Common Prefix Conversion Mistakes

That Skew Lab Results (And How to Avoid Them)

Article By Global Instruments

Science Education Series — In every laboratory, from a high school chemistry classroom to a pharmaceutical quality-control facility, measurements are only as good as the units attached to them.