Probably I wad lucky to get a good piece of equipment, as if used according to recommendations in manual it works fine for home use. It says about 3 - 30% mistake so just keep it in mind
The seller shipped very fast to Germany and well packaged. The device itself seems working fine. On arrival the battery was lose. I had to unscrew 2 screws and glue it to the PCB. The case looks a bit cheap (thin). You can see the display shine through it. But it doesnt affect the measurement