This QuickCar Brake Caliper Pressure Test Kit has a 0 to 1,500 PSI range and includes 2wo gauges. Gauges fit a standard 1/8" NPT thread bleeder which is common on most aftermarket racing brake calipers. Simply take out the bleeder after bleeding and screw in the 1/4"-28 tapered gauge & adapter. Then the total pressure at the caliper can be obtained and brake bias set accordingly. Sturdy carrying case is also included. Sold as one kit.