Optics 58-90% Percent Brix Honey Refractometer tester meter with Extra Cover Built-in Calibration Knob</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Built-in Calibration Knob， no need for a mini-screwdriver</li><li>Made w/ highest and finest quality of aluminum & rubber making it lightweight， durable and last long</li><li>Verify the quality after picking or harvesting</li><li>Check the ripeness of fruit whilst it's growing</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/519KxKShj3L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41k4vqrCY9L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51Uhmmey2wL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51ZU4DcpUuL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41KZD3Te05L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41cRrHaB8wL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41JjBMrkFSL.jpg' noproxy></br>