Mine consistently reads higher and has done so for some time now. When I contacted Autel,they wanted me to send it to China, on my dime, which is very expensive. I declined. SO anywhere I can, I warn folks not to buy Autel products, especially from non-official USA resellers.
USA Autel does not stock, sell or service this model.
I offered to return to seller out of California and have him return, but he said no. A friend also bought this model on my initial recommendation, he was able to dump his!
There are older posts under this section on this also, from us.