MF-2 Chamber 5.8" x 6" x 6.3" 2300°F Max Temp. Manual Control 115V MF-2A Same as above with Digital Control MF-4 Chamber 8.5" x 9" x 8.8" 2000°F Max Temp Manual Control 115V MF-4A Same as above with Digital Control MF-6 Chamber 13" x13.5" x 8.8" 2000°F Max Temp Manual Control 230V MF-6A Same as above with Digital Control