When sourcing 'cheap' thermal cameras, you must balance cost with functional performance. Prioritize Thermal Resolution (entry-level usually starts at 80x60 or 120x90 pixels), Thermal Sensitivity (NETD) (look for <50mk to <70mk for better image clarity), and Frame Rate (standard export models are often 9Hz to comply with international regulations, while high-end versions reach 25Hz-60Hz). Ensure the Temperature Range meets your specific use case, typically -20°C to 150°C for basic industrial inspections.