The device features a handheld design, making it compact and lightweight, with multi-functional capabilities: it can accommodate up to 7 parameters, with optional sensors for O₂, CO, NO, NO₂, SO₂, H₂S, NH₃, CO₂(NDIR), N₂O(NDIR), CH₄(NDIR), etc.; it can measure flue gas temperature, ambient temperature, and flow rate/volume; and it automatically calculates CO2, excess air coefficient, combustion efficiency, heat loss, and other parameters.