Spectral Sniffer

A broad-spectrum residue reader aimed at cargo inspectors, field chemists, and suspicious engineers. Draw it across a surface and it compares reflected light, vapor traces, and fluorescence against a local library. Grease and cleaning solvent complicate everything. Sample updates improve accuracy but quietly advertise what substances the owner expects to encounter. Praxis recommends a bench check after hard use; skipped certificates are cheap until an insurer asks for the last valid one. The resale value of Spectral Sniffer lives in its reference history, not its casing. One missing calibration turns precise measurements into expensive suggestions, especially when customs has already opened the crate.