The PowerARC 160i STH is a completely new model that succeeds the PowerARC 160STH. This model retains all the functionality of the older model, but does so with a more reliable and compact digital design. The features that made the PowerARC 160STH popular are still there in this new model, but the unit features better TIG performance and now can be fitted with the long-life, high quality NOVA foot pedal. An IGBT inverter design is still at the heart of the unit, but the new digital control simplifies internal circuitry and reduces maintenance and improves long term serviceability options. For people seeking a basic DC TIG and Stick welder, this unit has what you need. If you need a little more features, take a look at the new PowerARC 161STH which includes professional level TIG and Stick Functions.