The TECHT Stainless Steel Gauge Pin allows Tippmann Phenom to observe and/or monitor thier operating pressure. The TECHT Gauge Pin is constructed of stainless steel and is offered in silver or black. The SS Gauge Pin can be used during play or can be used just during tuneups. The pin also includes a 0-600 psi micro gauge to easily reference your operating pressure. As with all TECHT Products the Stainless Steel Gauge Pin carries a limited lifetime warranty.