Drawstring meter one is off I know 2 instances. Mine was off plus .04, Maestro Vapes off plus .05 both these plus side. Says .1 +- on the site but if you go to distributor its off guaranteed to be within +-.4 on ohms. Voltage is .01 +- is that. But mixed up when they quote.
USA meters are the best, less wait also. When it comes I ordered. I am adjusting my drawstring meter to it. Found out how to adjust it. Adjusting to sub ohm readings from the USA meter. Watch the Youtube videos.