The TC-344B Dual Channel Automatic Heater Controller from Warner. Instruments is a versatile and simple to use thermal control device. It contains:

Dual Channel Temperature Controller	TC-344C
Cable assembly for heater controllers to platform	CC-28
PH-2 Platform for Series 20 chambers, heater	PH-2
Adapter cable to connect CL-100/CL-200A to 8 pin DIN heaters	ACC-1