{"statement_id":"st_0d3395afd6c22c91f7e4","subject":{"kind":"product","slug":"surface-book-2","name":"Surface Book 2","url":"https://sourcetier.com/products/surface-book-2"},"attribute":{"key":"weight_lb","label":"Weight","unit":"lb","core":true},"scope":null,"region":null,"first_recorded_at":"2026-09-02T02:21:02.621Z","current":{"claim_id":"ee76a690-c8c2-4f5d-9b8a-747e4534f491","value":3.38,"unit":"lb","verification_state":"verified","confidence_recorded":90,"observed_on":"2026-09-02","recorded_at":"2026-09-02T02:21:02.621Z","ended_at":null,"ended_by":null,"superseded_by_claim_id":null,"withdrawal_reason":null,"valid_from":null,"extraction":"muster:(?<![\\d.])(\\d\\.\\d{1,2})(?![\\d])\\s*(?:lb|lbs|pounds)\\b","reader":"text pattern","parser_version":null,"method":null,"excerpt":"...ul enough to run professional-grade software and play PC games New USB-C port Starting at 3.38 lbs (1,534 g) including keyboard Runs Windows 10 Pro Out of stock Build your device Free 2-3...","sources":[{"url":"https://www.microsoft.com/en-us/surface/devices/surface-book-2/","tier":1,"type":"official_documentation","retrieved_on":"2026-09-02","role":"evidence"},{"url":"https://www.microsoft.com/en-us/surface/devices/surface-book-2/","tier":1,"type":"official_documentation","retrieved_on":"2026-09-03","role":"evidence"},{"url":"https://www.microsoft.com/en-us/surface/devices/surface-book-2/","tier":1,"type":"official_documentation","retrieved_on":"2026-10-07","role":"evidence"}]},"version_count":1,"versions":[{"claim_id":"ee76a690-c8c2-4f5d-9b8a-747e4534f491","value":3.38,"unit":"lb","verification_state":"verified","confidence_recorded":90,"observed_on":"2026-09-02","recorded_at":"2026-09-02T02:21:02.621Z","ended_at":null,"ended_by":null,"superseded_by_claim_id":null,"withdrawal_reason":null,"valid_from":null,"extraction":"muster:(?<![\\d.])(\\d\\.\\d{1,2})(?![\\d])\\s*(?:lb|lbs|pounds)\\b","reader":"text pattern","parser_version":null,"method":null,"excerpt":"...ul enough to run professional-grade software and play PC games New USB-C port Starting at 3.38 lbs (1,534 g) including keyboard Runs Windows 10 Pro Out of stock Build your device Free 2-3...","sources":[{"url":"https://www.microsoft.com/en-us/surface/devices/surface-book-2/","tier":1,"type":"official_documentation","retrieved_on":"2026-09-02","role":"evidence"},{"url":"https://www.microsoft.com/en-us/surface/devices/surface-book-2/","tier":1,"type":"official_documentation","retrieved_on":"2026-09-03","role":"evidence"},{"url":"https://www.microsoft.com/en-us/surface/devices/surface-book-2/","tier":1,"type":"official_documentation","retrieved_on":"2026-10-07","role":"evidence"}]}],"changes":[{"id":"27798","type":"documented","label":"First documented","material":true,"sentence":"Surface Book 2: Weight documented as 3.38 (verified). A first finding of ours, not a change at the vendor.","noticed_at":"2026-09-02T02:21:02.621Z","subject":{"kind":"product","slug":"surface-book-2","name":"Surface Book 2"},"before":null,"after":{"value":3.38,"verification_state":"verified","confidence":90},"claim_id":"ee76a690-c8c2-4f5d-9b8a-747e4534f491","statement_id":"st_0d3395afd6c22c91f7e4","corrected":null}],"page_url":"https://sourcetier.com/statements/st_0d3395afd6c22c91f7e4","contract":"A statement is the question a claim answers: one subject, one attribute, one scope and region. statement_id stays the same when a new value supersedes the old one, when we withdraw it and when two duplicate entities are merged (the old id then redirects). claim_id identifies one version. versions lists every version oldest first; ended_by is superseded, withdrawn or null for the current one. confidence_recorded is the confidence stored when that version was written, not a recomputation. unknown describes our research, never the product."}