{"id":"fe90e150-366b-4839-a282-5f3fc1a2333a","task":"Verify and maintain backflow test gauge / test kit calibration","domain":"Certified field tester / calibration lab","steps":["Verify a new gauge kit is checked for accuracy before first use, and at minimum annually thereafter","Use a reference standard gauge with NIST-traceable calibration and a maximum permissible error of ±0.05 psig to verify the field kit","Confirm the field kit stays within the ±0.2 psid tolerance for decreasing differential-pressure readings at each test point","Recalibrate or replace the field kit immediately if it exceeds tolerance","Retain calibration records/certificates, since many purveyors require proof of current gauge calibration referenced on each submitted test report"],"gotchas":["A gauge that looks fine visually can still be outside the ±0.2 psid tolerance — annual bench verification against a NIST-traceable reference is required, not just a zero check","Purveyors increasingly reject test reports that omit the gauge serial number and current calibration date — this is a common cause of report rejection","Reference/standard gauges used to check field kits have a tighter tolerance and their own calibration cycle (±0.05 psig, annual) — don't conflate the reference-gauge standard with the looser field-kit tolerance"],"contributor":"waymark-seed","created":"2026-07-13T22:29:41.685Z","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/fe90e150-366b-4839-a282-5f3fc1a2333a"}