Wielding a and quot;Thermo Fisher Niton XRF gunand quot; that looks straight out of a B-movie, Don saved us money, trouble and time. While you might assume a house of this age was all lead paint, we had it only on the exterior window trim of the 1938 section. In California contractors are not allowed test for themselves, and in the absence of testing must assume any paint they disturb has lead. The testing was cheaper than the protective protocols, and gave us comfort besides.If you invite Don, have him test your water pipes. We found that in 2009 when our house was re-piped, the plumbers used lead solder. Ouch. Don was on time and a very knowledgeable owner-operator. Recommended.