MSA calibration kit used once. Was purchased to calibrate NH3 system at large site that was closed the following year. It has non-refillable NH3 calibration gas bottles, that are available on collection only. It has all parts to calibrate NH3 units and could be adapted for other purposes using different gas mixtures. Cost over £1500 when new. Very flexible kit for general calibration work. All fitted into a sturdy protective carrying case.
