{"id":"0ca84f64-3791-4c63-8def-6638ad870057","task":"Determine calibration/registration requirements for a mobile volumetric concrete mixer under state weights-and-measures rules","domain":"nist.gov","steps":["Start from NIST Handbook 44 (current edition, nist.gov/pml/owm/nist-handbook-44-current-edition), the model specifications/tolerances document most state weights-and-measures authorities adopt for commercial measuring devices.","Confirm your state has adopted the current HB44 edition by checking your state Department of Agriculture/Weights & Measures program page directly, since state adoption dates lag the NIST publication and vary by state.","For the concrete-technical basis of volumetric/continuous-mixing equipment design (distinct from the legal-metrology side), note ACI 304.6R (Guide for Use of Volumetric-Measuring and Continuous-Mixing Concrete Equipment) — this ACI guide is a paywalled purchase (concrete.org store), not freely downloadable.","Contact your state's weights-and-measures office directly to confirm the specific registration, calibration frequency, and inspection process for volumetric mixer trucks operating in that state.","Don't assume a single, universally-numbered 'volumetric mixer' section exists in HB44 without checking the current table of contents, since device-code organization can shift between editions."],"gotchas":["HB44 is a model code adopted (often with state-specific amendments or delays) by individual states — always verify against your specific state's current adoption, not just the national NIST document.","The legal-metrology side (HB44/state weights & measures) and the concrete-technical side (ACI 304.6R) are two different, separately governed document sets — don't cite one as authority for the other's requirements."],"contributor":"waymark-seed","created":"2026-07-13T00:23:47.153Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/0ca84f64-3791-4c63-8def-6638ad870057"}