The Ga500W Measures & Displays Wobbe Index Only. ‚ It Does Not Provide Any Additional Displays Such As The Specific Gravity Or Calorific Value.‚  (If Additional Displays Are Require We Can Provide Our Wc Model Which Includes A Densitometer)‚  The Ga500W Needs To Be Installed Indoors In A Temperature Controlled Room.‚  The Temperature Should Be Maintained At 77‚°F +/- 5.4‚°F.‚  The Unit Must Be Accessible From The Front & The Back & The Height Of The Ceiling Must Be Higher Than 9Ft. ‚ We Provide The Unit With Casters Therefore It Needs To Be Blocked In Placed To Keep It From Moving. ‚  Service Connections Include Electricity, Calibration Gas @ 15" Wc, Sample Gas @ 15"Wc, Instrument Air & A Vent Line.‚  Algas-Sdi