Aloha my life on takeoff and landing depends on the accuracy of this device my FAA certified sensor was stolen for $500 this longacre sensor is no different if this test does not convince yourself you have a learning disability. I'm not talking about devices that move on the ground, I'm talking about airplanes. Twin Super King Air Turboprop engines. Low pressure tires are better for gravel, fire trails, grass, etc. Aloha.