Item Description: Sea Side Aquatics Refractometer Salinity Measure, monitor and control the concentration of salt water. Vital if you need to check salt levels for your aquarium. Healthy fish are happy fish! Ensure the percentage of salinity in your aquarium or pond is just how your fish like it. Essential piece of equipment used in research and clinical laboratories for checking and maintaining stock solutions and dilutions Vital for marine industry Its scale enables the direct determination of salinity in water that contains dissolved salt and little or no other dissolved solids. Ideal for field use ? refractometer has ATC [Automatic Temperature Compensation] for precise measurement without having to re-calibrate after changes in ambient working temperature. Specifications MODEL MEASURING RANGE MINIMUM SCALE SIZE(mm) WEIGHT(g) HT-211ATC 0~10%salinity 0.1% 30*40*205 275 1.000~1.070sg 0.001sg HT-212ATC 0~28%salinity 0.2% 30*40*205 215 Quality Approved by strict quality and safety standards Durable and built to last long Heavy-duty and lightweight with its copper construction with chromium coating Made with the highest and finest quality of copper rubber that makes it lightweight Cushioned with soft comfortable non-slip rubberized grip handle Adjustable manual focusing Calibration screw Special Features Equipped with tri-scale measurement (water, baume brix) that provides direct reading Adjustable manual focusing Soft rubber eye piece for comfortable viewing Calibration screw ATC ? Automatic Temperature Compensation Easy to focus and calibrate Accurate testing results guaranteed Extremely easy-to-use and calibrate A Set Includes 1 New Salinity Refractometer with Built-in Calibration Knob 1 Instruction manual 1 Pipette Sturdy Plastic carrying case package International Shipping: International shipping is via either US Postal's Global Priority (Air) Mail, which is $15.00 ($12.00 to Canada) and takes 3-8 business days. Shipping Insurance is an additional $15.00. Questions? Larger orders? Multiple Orders? Prefer a different shipping method? Please feel free to call, fax or e-mail! Other types of Portable Refractometers are available through our Store! Check out our other items! National Industrial Supply 30777 Rancho California #891420 Temecula, CA 92589, USA Sales: 951.308.9269 Fax: 310.833.7306 We prefer Paypal!