Portable Automatic Temperature Compensation Salinity Refractometer for Aquarium， Hydrometer， 0-100ppt & 1.000-1.070 Salinity Specific Gravity</br></br></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/51FTKMKDaOL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51780ysheHL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/518tBHJbH%2BL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51qDi7OIAtL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51pGo8fWoZL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51sBh5boizL.jpg' noproxy></br>