The standard jack Circuit Box is available from one to six jacks and in two materials. Standard material jacks are good to 400 degrees Fahrenheit. High temperature jacks are good to 800 degrees Fahrenheit. All high temperature jacks are color coded ‘red.’ All standard jacks are coded per thermocouple calibration.

The miniature jack Circuit Box (not shown) is available with two from to six jacks. All jacks are marked with thermocouple calibration, color coded and numbered. These jacks are good to 400 degrees Fahrenheit.