When evaluating technical performance, focus on the Distance-to-Spot Ratio (D:S); a higher ratio (e.g., 12:1 or 50:1) allows for accurate measurement from a safer distance. Ensure the Emissivity setting is either adjustable or preset to 0.95 to match the materials you are measuring. For medical grade, the Accuracy tolerance should be within ±0.2°C (±0.4°F), while industrial models typically range around ±1.5% or ±1.5°C. Additionally, check the Response Time, which should ideally be under 500ms for high-efficiency screening.