18/09/2026
We publish a lot of material explaining where our analyzers are the right tool. This is the other kind.
If you do federally regulated lead-based paint inspection in the United States, you cannot use a ProSpector. Not because it measures lead badly — it measures lead well. Because of a document.
An XRF analyzer used for regulated lead paint work must hold a Performance Characteristic Sheet issued by HUD for that specific make and model. HUD's wording leaves no room:
"If an XRF analyzer does not have a PCS, or if it is not used, or if the data are not analyzed, in accordance with its PCS, the actions undertaken with it are neither a lead-based paint inspection nor paint testing."
Two instruments can produce identical numbers on the same wall, and only one of them produces a legally valid inspection. Elvatech analyzers do not currently hold a PCS. If that is your work, buy from the HUD list — the Niton XLp and XL-309 series, the Viken Pb200i, the LPA-1, and the others published by HUD and the National Lead Information Center.
We would rather lose the sale than have someone discover this when their report is challenged.
Our Head of Laboratory wrote the full guide this month, and it covers what actually applies in 2026:
→ The threshold is 1.0 mg/cm² or 0.5% by weight, under 40 CFR 745.103
→ Maximum TSCA penalties are $49,772 per violation per day — and unchanged from 2025, because the inflation adjustment never happened after the autumn government lapse. The $37,500 figure still circulating online is several cycles out of date.
→ An inconclusive result is a defined outcome, not an instrument failure. It goes to a laboratory. It does not get resolved by taking readings until a convenient one appears.
→ The end-of-day calibration check is the one people skip and the one that invalidates the day's work.
And the part where our instruments do belong: lead in soil, in consumer products and toys against CPSIA limits, in scrap and solder, in RoHS screening, in service-line inventory work for utilities. None of that is regulated paint inspection, none of it requires a PCS, and all of it is a larger field than the part we are ruling ourselves out of.
Read the guide → https://f.mtr.cool/hhhayz4suj
XRF lead testing under EPA RRP: the 1.0 mg/cm² threshold, the HUD Performance Characteristic Sheet rule most buyers miss, penalties and field protocol.