Specifications include, but are not limited to: XRF system requirements: 1. All technical data must be supported by the most current EPA/HUD Performance Characteristic Sheets (PCS) document (i.e., must be EPA and HUD-approved). 2. The source must be a Nuclear Regulatory Commission-exempted Cobalt-57 and the Activity should not exceed 6mCi. 3. The instrument must use K-shell analysis, as recommended by the HUD/EPA Chapter 7 Guidelines. 4. The system must have a grip or handle for ease of measurements and to assure operator has positive grip on the instrument. 5. The instrument must be a one-piece unit and weigh less than two (2) pounds with battery installed. 6. The instrument must include three NiMH battery packs. Unit must be able to retain previously captured data to allow for change-out from one battery to another in the field. 7. The instrument must include a 110/220 VAC battery charger and a car charger. 8. The instrument must be calibrated so that its calibration can be verified with NIST based standards as required by the PCS document. 9. The instrument must have a built-in camera, touch-screen, and be wi-fi/Bluetooth enabled. 10. The instrument must be capable of operating in temperature ranges of 20°F to 120° F. 11. The instrument price must include lifetime software and hardware upgrades. 12. The instrument must interface with a PC for data transfer. Software requirements: 1. A comprehensive software package for download of XRF-measured lead concentration data and consequent data reduction and report generation. 2. The Report Generation Software should be an interactive PC-based software package for data download and report generation capable of working in an MS Windows Environment. 3. The software must provide universal capability of identifying locations, components, paint conditions, and structures in a report without limitations.