For clear-coated floors, take one reading in one room equivalent if the finish appears to be the same across rooms. Characteristic Sheets New edition of PCSs reorganized with key information up front. Some instruments have inconclusive ranges. The inconclusive range depends on the XRF model, the substrate and the nominal reading time. The second edition of each PCS has been adjusted to reflect the change of the inconclusive range so that the conclusions of inspections using the first edition are still valid.
Some instruments have a threshold value.
The threshold depends on the XRF model, the substrate and the nominal reading time. The definition of threshold is the same for the first and second editions of the PCSs, so the values have not changed. Substrate Correction Consult PCS for procedure and calculations. Confirmatory Testing Laboratory analysis to be reported in milligrams per square centimeter. In multifamily housing, aggregate values to decide whether confirmation is needed.