So far I’ve only used the deflators once, and it was yesterday actually. I put them on and headed down the road, about a mile later all my tires were the same pressure. Now I did not set them with any kind of air gauge or anything but I just eyeball them and they were within one PSI of each other. Two were set to 14 psi and two were set to 16 psi and I sent them only by Eye hoping for just 15 psi so they averaged out perfectly. I was pretty impressed. I’ll definitely be letting other people know about this product.