Review on 🚲 LEZYNE Classic Floor Drive Bike Pump: High Pressure 220psi, Presta & Schrader Valve, Durable Hose, 3.5" Gauge by Maurice Morris

I inflated a road bike tire (Presta valve) to 110psi and then checked the tire pressure with an Accu-Gage Professional pressure gauge which read 100psi. I'm assuming the professional tire pressure gauge is correct, which makes me doubt the accuracy of the Lezyme pressure gauge built into the tire pump. It also rattles when I lift the pump. I can't determine where the knocking is coming from; probably either a pressure gauge or possibly an internal piston. I wonder if this is normal with Lezyme pumps? The dual valve device works well as I've easily inflated bikes with Schrader or Presta valves. The deflation feature when inflating a tire is only really useful with Schrader valves as when used with Presta valves the pressure drops 10-40psi per minute in NYC.