The price of a GC machine is primarily driven by its detector type (FID, TCD, ECD, or MS) and column configuration. For high-precision pharmaceutical or environmental testing, a Gas Chromatography-Mass Spectrometry (GC-MS) system is required, which commands a premium price due to its sensitivity. Ensure the unit features Electronic Pneumatic Control (EPC/AFC) for carrier gas stability, as manual pressure control models are cheaper but less accurate. Additionally, the temperature control precision (typically ±0.1°C) and the heating/cooling rate of the column oven are critical benchmarks for high-throughput laboratories.