The maximum weight shall not exceed 805g, and the minimum weight shall not be less than 795g. This is a question of judging whether the product is qualified according to the error. "Net weight 800 5g" refers to the standard 800g, with the maximum 800+5 = 805g and the minimum 800-5 = 795g. So the answer is that the maximum weight is no more than 805g and the minimum weight is no less than 795g.