Highly sensitive and selective gas detection & gas measurement device with laser technology for the inspection of underground gas pipes using suitable probes (e. g. carpet probe). The device can also be used for the vehicle-based pipeline inspection. With built-in diaphragm pump, Bluetooth module and rechargeable Li-Ion battery. One out of two different laser modules can be assembled: – single laser module for methane or – dual laser module for methane & ethane Moreover, the device can be equipped with additional sensors to enable further applications. The following applications are possible: – Inspection of underground pipes – Inspection of accessible pipes in buildings – Inspection of accessible pipes on plants, etc. – Inspection of ground soil for pinpointing (optional) – Purging of gas pipelines (optional, only in combination with pinpointing) – Gas analysis (with dual laser module) Operating time up to 10 hours Measurement range depending on built-in sensors Dimensions (LxWxH): 143 x 240 x 85 mm Weight: 2.1 kg Temperature ranges: 0 °C to 40 °C (dual laser module) -10 °C to 50 °C (single laser module)