Good looking machine. Greatly appreciate effort company makes to provide EVERYTHING necessary to start using the instrument immediately. Great support from the company. Early in my use of the instrument, the fuel solenoid was malfunctioning. This was very unexpected and I am told had not happened previously. Diagnostic information and replacement part were easy to understand and use. Now the machine functions well every time I use it. One modification that I made to produce more consistent and stable reading is the addition of a peristaltic pump to introduce the sample into the instrument. I found that the aspirator was not very stable. I like storage of data on PC. User instructions and actions to store the data log file could be improved to make it more obvious that data will be stored and is being stored during the use of the instrument.