cheap salinity refractometer?

[davidmaguirre]

Hello I want to get a refractometer but I am tight on $$$ so I saw a couple on eBay around the $30 ? Does anyone have one of these off eBay? Which one should I get? Also what do they mean when it says 0-10% ? Please give me some info.. thank you!

 

[huma-huma]

The 30$ ebay one works wonders. I ta actually recommended by alot of veterans on here. Just don't forget to calibrate it

 

[carey]

Heres the link for it

eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices