Do not expect to much. 409shop seems to be a good firm, that is, so good that people take the trouble of copy them.
The meter you ordered is as far as I can find everywhere between 60 and 100 dollar. Yours was 28 dollar. That would be to good to be true for me.

So it can be a fake or used one.
The real 409 shop in the link downhere ( that uses the same picture/logo ect) asks much more as 28 euro and warns for copycats:
http://www.409shop.com/409shop_auctionsearch1.php?userid=100556A Dutch Ham bought a porto at the copycat 409Shop. It did not work when he received it. He returned it, costed him 17 dollar, they told him they would send a new one, the new one also did not work ( not strange because it had the same serialnumber, only the box was changed, so a pure scam)