Test 320 B Gas Analyser kit including - 
Printer (spare roll of paper)
Differential temperature sensors
Probe
Adaptor and hose for pressure testing.

I have owned this from new. It has been calibrated as required each year by JMW LTD in Harlow.
Next calibration is due in August.
Only problem I have had with it required a new PCB which was completed by JMW LTD in Harlow. 

I have upgraded to a new unit and have no need for this now. Will suit a newly qualified gas fitter.