Our Client engaged a third party to duplicate a Digital Gauge attached to an oxygen tank used for patient care. The new Gauge was to be lighter weight (plastic) and was designed to use a LED instead of a power-consuming backlight. Otherwise it was expected to be functionally a duplicate. ASG had been exposed to the previous code and was well equipped to walk through the new code on the new device. ASG was asked to review validation documentation that was being developed by our client.