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The Gravity SFA40 is a high-precision formaldehyde sensor for HCHO concentrations of 0–1000 ppb with a typical accuracy of ±20 ppb or ±20% m.v. in the 0–200 ppb range. It is the successor to the SFA30 and is fully compatible with Project Aura—both electrically and mechanically for installation in the 3D-printed enclosure used there. You