What do you think of this ppm meter?

Found this on ebay today. What do you think about it? It's only $15, but when something is cheap, well it usually doesn't work well. Anyone just happen to have one and knows the quality?


http://www.ebay.com/itm/New-Digital-TDS-Meter-Tester-Water-PPM-Filter-Purity-/280667455017?pt=Small_Kitchen_Appliances_US&hash=item4159157e29