EN 45501 Weighing Instruments: Accuracy Classes and Testing

en-45501-weighing-instruments-A Class III trade scale's data plate showing its verification scale interval and accuracy class markings

By Jayson · Updated August 2026 · 9-minute read EN 45501 weighing instruments: are non-automatic weighing instruments (NAWIs) tested and classified according to EN 45501:2015, the EU harmonised standard that gives presumption of conformity with Directive 2014/31/EU’s essential requirements. It defines four accuracy classes (I, II, III, IIII), sets the verification-scale-interval system those classes are … Read more

Weighing Scale Verification UK: Requalification, Disqualification and Approved Verifiers

weighing-scale-verification-uk

By Jayson · Updated August 2026 · 8-minute read Quick answer: Weighing scale verification UK isn’t one single process — it’s two distinct legal events under SI 2016/1152. Verification is what happens to a new trade scale before it’s ever used. Requalification is what happens afterward, specifically when a disqualification mark has been applied under … Read more

NAWI Regulations UK: What SI 2016/1152 Requires

The printed text of the NAWI Regulations UK (SI 2016/1152) beside a weighing instrument carrying its UK marking

By Jayson · Updated August 2026 · 9-minute read Quick answer: NAWI regulations UK refers to the Non-automatic Weighing Instruments Regulations 2016, SI 2016/1152, the statutory instrument that implements Directive 2014/31/EU into UK law. It’s built from 10 Parts covering essential requirements, conformity assessment, economic operator obligations, market surveillance, and a dedicated offences section with … Read more