The Ingersoll Rand 3/4" Impact Wrench, No. 2146Q1MAX, is the first pneumatic impact wrench with an innovative visual air guage that indicates whether it is operating at, below, or above the tool's maximum rated air pressure of 90 psi. The new onbard air pressure gauge uses three different colors–yellow, green, and red–to indicate how much air pressure the tool is receiving. The 2146Q1MAX empowers the operator with unprecedented control and efficiency.