CINCINNATI SUB ZERO Z-8-1-1-H/AC Low Temperature Environmental Test Chamber. Digital programmable Watlow F4 controller. Watlow temperature limit controller. RS232 Communication port. Temperature Range: -68°C to +190°C. Inside Dimensions: 24” x 24” x 24”. Two 6” Cable ports. Glass viewport in door. 208V, 3 Ph, 60 Hz, 23A