The Touch 4 fingertip control is an all-new approach to TIG welding amperage control. The idea is simple and innovative, and the result is a steady hand and excellent control. Instead of a knob that you have to turn or a slider that you have to move while trying to hold your TIG torch steady, the Touch 4 relies on pressure applied by your finger. The Touch 4 works in steps: you apply pressure to turn on the contactor, giving you your low-amps setting, and then you increase pressure through 4 steps: 25%, 50%, 75%, and 100% of the setting on your panel. Set the amps on your panel to about 33% more than the suggested current for the thickness and metal type, and then you simply dither to create the puddle and weld that you want. The Touch 4 is designed to work with almost any welder and can be used to replace Miller hand controls such as the RCCS-14 (043668) or RCC-14 (151086), Lincoln models such as K963-3 Hand Amptrol, ESAB, Thermal Arc, AHP, Everlast, and more. Includes 30-day money-back guarantee. US Patent 9,550,250 B2. Designed and made in the USA.