The Fluke Calibration 9150-B-156 Thermocouple Furnace with Model 3150-3 ("B" Insert), 150 °C to 1200 °C uses Hart's own microprocessor-based controller for great stability and set-point accuracy. It has a removable well insert for versatility. It has rapid cool-down and heat-up times. And it comes with an RS-232 port for connection to a PC. With interchangeable temperature blocks, you can check thermocouples as small as 1/16 of an inch in diameter. The 9150-B-156 works with 115V or 230VAC power.