When evaluating an XRF analyzer, the Detector Type is paramount; Silicon Drift Detectors (SDD) offer superior resolution and faster count rates compared to standard Si-PIN detectors, making them ideal for light element analysis (Mg, Al, Si). You should also verify the X-ray Tube Voltage, typically 40kV to 50kV, to ensure sufficient excitation for heavy metals. Additionally, check the Library Capacity, ensuring the device includes a comprehensive Grade Library (e.g., ASTM, DIN) that can be customized for specific alloy series like Stainless Steel, Tool Steel, or Cobalt alloys.