Everything is OK! Perfect seller!
The sensor is very old. Range work is 9mV -13mV mine have max 9,86 mV. New must have 13 mV. This know everyones . Sensor less 10% per year. This sensor dont live one year . Seller dont see a problem !
Sensor is used he have max 9,86 mV . New one must have 13 mV. This one have two or three year old. Sorry seller And AliExpress dont see a problem ! Under 9 mV is very danger for life.