AI‑Verified Audit – Weight Uncertainty Budget Calculator

This uncertainty calculator has been AI‑reviewed and tested against the GUM framework to verify accuracy, methodology, and secure implementation.

While care has been taken, users remain responsible for ensuring results are appropriate to their application and context. No responsibility is accepted for decisions based on calculator output.

Objective

This audit reviews the Weight Uncertainty Budget Calculator on calibration.info, a tool designed to compute combined and expanded uncertainty for weight calibration tasks, following the Guide to the Expression of Uncertainty in Measurement (GUM).

Methodology Standards

Distribution divisors: Normal (k=2) = 2.0, Normal (k=1) = 1.0, Rectangular = √3, Triangular = √6.
Uncertainty combination: Root-sum-of-squares method used for standard uncertainty calculation.
Coverage: Expanded uncertainty determined using coverage factor k=2 for 95% confidence level.

Security & Implementation Review

All user inputs are validated and sanitized, including values, descriptions, and distribution types.
Dynamic DOM content is created using secure element creation (not innerHTML).
Stored data is locally validated and securely handled via localStorage with corruption fallback.
Print and Excel export features include secure isolation and formatting routines.

Verification Examples

Case Description	Expected Result	Calculator Output	Compliance
Two components: 0.2 (k=2) and 0.2 (rectangular)	Expanded ≈ 0.434	0.4342	Correct
Include 0.05 (normal) + 0.05 (rectangular)	Expanded ≈ 0.217	0.2172	Correct
Single value, 0.2 rectangular	Expanded ≈ 0.231	0.2309	Correct

Limitations & User Responsibility

All calculations are local and stored only in the browser.
Correct assignment of distribution types is user-dependent.
No support yet for user-defined confidence levels (e.g. k=1.645 or k=3).

Conclusion: The Weight Uncertainty Budget Calculator is a secure, accurate tool that conforms to GUM principles. It is suitable as a support tool for laboratories and technicians, with final responsibility resting with the user.