Most secondhand sellers write "used, good condition." We define exactly what that means — per grade, per test item — and we photograph the flaws. Every item we list is function-tested and graded A, B or C; we do not sell untested items.
| Grade | Function | Cosmetics | Warranty | Typical price vs. new OEM part |
|---|---|---|---|---|
| Grade A | All applicable function tests passed | Near-new; no visible wear | 90 days | 25–40% |
| Grade B | All applicable function tests passed | Light visible wear; fully serviceable | 90 days | 15–25% |
| Grade C | All applicable function tests passed | Obvious cosmetic wear; structure intact | 90 days | 8–15% |
Price ratios are internal guidance only and are not shown on product pages. The grade you see on a listing always reflects the worse of function and cosmetics per the table above.
Test items differ by component type. Each product page lists exactly which tests were performed on that specific unit.
Element map scan on a compatible system · image uniformity & dropout check · cable continuity & strain · connector pin inspection · lens / sheath condition.
Angulation full-range check on test bench · insertion tube integrity & flexibility · image output & dead-pixel scan (CCD modules) · seal and valve fitment.
Power-on self test · output rail voltages under load · burn-in (2–4 h) · connector & conformal-coating inspection.
Switch / lamp ignition cycling (×10) · meter-hour reading recorded where applicable · continuity and travel checks.
Every Grade A / B / C unit ships with a test record on request. A redacted sample is available — just ask via WhatsApp or the RFQ form. The record includes: Zimiao SKU, system it was harvested from (model & serial), test bench used, test items with pass results, and engineer initials.
Sample placeholder — upload a real redacted PDF here before launch (素材清单 item #3).
Send us the SKU — full test record within 1 business day.
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