Sper Scientific 300011 Salt Refractometer with ATC， 0-100 ppt</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Sper Scientific 300011 Salt Refractometer w/ATC 0-100ppt Double scale in parts per thousand and specific gravity. Measures salt content in sea water， aquariums， breeding ponds， or pickling-brines. Specific Gravity Baum</li><li>Double scale in parts per thousand and specific gravity</li><li>Automatic Temperature Compensation (ATC)</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41T0OB3pi0L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/315vReCRcEL.jpg' noproxy></br>