Specifications include, but are not limited to: MODEL T750U PORTABLE DYNAMIC DILUTION CALIBRATOR NumaView™ Software DILUTION GAS MFC 0-20 SLPM SOURCE GAS MFC 0 -100 CC/MIN 0-20 cc/min MFC is also needed Rugged traveling case with wheels and retractable handle Internal ozone generator and GPT mixing chamber UV Photometer module Product manuals on CD Two-year standard warranty TAPI Customer Service support by phone, fax, or email for the life of the instrument MODEL 751H PORTABLE HIGH PERFORMANCE ZERO AIR SYSTEM Standard 10 SLPM @ 30 PSI Rugged traveling case with wheels and retractable handle Hydrocarbon & CO scrubber Product manuals on CD Two-year standard warranty TAPI Customer Service support by phone, fax, or email for the life of the instrument