Bests & Worsts Reviews from Amazon

I have been 4 wheeling, off road racing and professionally rock crawling for over 20 year and now own my own shop. These deflators are as accurate as any i have used. The only criticism that I can give them is that they take slightly longer to deflate than the more expensive ones I have used, the setting instructions could be better written and there is a of lack instruction on fine tuning. This is how I set deflators for myself and my customers, regardless of brand: First, setting any delator takes time and patience, so it is a good task to do while you are doing something else on your rig out in the shop. Set a tire to your desired deflation pressure with a known-accurate, professional dial gauge, the same gauge that you will carry in your rig. These are a good investment compared to the cost of replacing a tire due to an inaccurate pressure reading. Back the lock nut on the deflator off, then screw the deflator on to the valve stem. Make sure the shop is quiet, put your ear close to the deflator and slowly unscrew the cap until you hear air escape. Screw the the cap back in until no air is escaping. Tighten the lock nut finger tight without turning the cap. Remove the defalator and air the tire back up to road pressure. Re-install the deflator and leave it for a good while until you cant hear any air escaping. This can take 7-8 minutes. Remove the deflator and check the air pressure in the tire. It will probably be within 1-3 psi. from your desired deflation pressure. Carefully loosen the lock nut and adjust the cap. Screw it in clockwise to increase pressure, screw it out counter-clockwise to decrease pressure. It only takes a very small amount of rotation to adjust the valve, 1/16th to 1/8th of a turn to adjust 1 psi. With practice, you will get a feel on how much to turn it. Re-inflate the tire to road pressure and install the deflator. After waiting for it to deflate, recheck the pressure. Re-adjust the cap and repeat until you have reached your exact desired deflation pressure. Once you have all four adjusted, carefully tighten the lock nut with two pair of pliers being careful not to rotate the cap. Retest to verify your final setting. I have not had any problems, but it would make sense to double check the pressures after using the deflators the first few times on the trail. Zag's Garage, Glendale AZ