I test my impact wrench on a good vice and with a high grade steel nut/ washers and bolt that can take high torque. Select bolt with thread almost to the head. Hold head of bolt on solid vice and place two washers(more if needed to reach into threaded area) and nut on bolt. Set air pressure to max (I have 125psi). Run nut against bolt head with impact. Remove nut with torque wrench for reading. This low tech method will give you a rough idea. Higher pressure may give you better result. If you have used your air wrench for a while. Clean by adding diesel fuel into air fitting. Little at at time until diesel comes out rather clean. Then add a few drops of oil. Then test again. Good luck.
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