sensitivity TIG switch core and shell assembly engineered for reliable control in argon welding. Key benefits Precise, responsive control: The sensitivity switch core delivers quick, reliable response for fine control during argon TIG welding, improving arc start/stop accuracy and operator feedback. Consistent electrical performance: Integrated switching mechanism maintains stable electrical contact and minimal signal delay to support steady current flow and repeatable welds. Durable for industrial use: Built from longlasting materials to withstand frequent operation in workshop and production environments. Safety and usability: Compact design fits comfortably into compatible torch handles, resists accidental triggers yet allows quick activation while wearing gloves. Includes integrated offswitch functionality for streamlined handling. Compatibility and options Compatible with 150 Torch models: WP17, WP9, 150A. Compatible with 300 Torch models: WP18, WP26, 300A. Compact form factor fits WP18 and other compatible torch models. Shell color options: blue or yellow. Function and performance sensitivity core tuned for TIG torch triggers to enable precise control over arc initiation and termination during argon welding. Integrated switch core and shell design reduces contact bounce and signal lag, supporting consistent current delivery for sensitive TIG work. Construction emphasizes durability and long service life under repeated use. Practical applications Precision TIG welding of thin materials where controlled arc starts/stops are critical to avoid burnthrough or warping. Maintenance and field work where a durable, glovefriendly switch improves speed and reduces accidental activation. Production welding environments using WP17/WP18 series torches where consistent switch performance reduces rework and downtime. What you get A sensitivity switch core with integrated switching mechanism. Shell options in blue or yellow. Compatibility with the listed 150 and 300 series torch models and an overall compact, robust design for professional TIG welding use.