The MSA GM portable test and calibration unit is a professional tool for testing, verifying and calibrating MSA ultrasonic gas leak detectors. The unit enables functional testing without the use of test gas, helping to simplify maintenance procedures and reduce operational costs. By generating a controlled ultrasonic test signal, correct detector operation can be quickly and reliably verified. This supports routine inspections, commissioning and maintenance of gas detection systems in industrial environments. The portable design allows easy on-site use.