Item Description: RHS-28ATC Portable Salinity Refractometer, 0-28% (0-280ppt) - Solid Construction in a SOFT Case Perfect for Pickling Brine Solutions, Deep Hole Oil Drilling AND De-Icing Equipment! Not suitable for Salt Water Aquariums! See our other Salinity Refractometers! Product Specs * Ranges: 0-28% Salinity / 0-280 Parts per Thousand * Accuracy: +/- 0.20% * Divisions: 0.20% * Sturdy design made of Aluminum and comes with a 3 Year Warranty Included are: A plastic hardcase, a pipette for dropping test fluids onto the prism (never dip the refractometer into the test fluid!), a mini screwdriver for scale calibration, and a Users Guide. One NEW RHS-28ATC (0-28% Salinity Scale) portable Salinity Refractometer in a blue, foam-lined hard case. The RHS series of portable refractometers is designed to measure the salinity of sea water and saline solutions of similar concentration. This unit is ideal for the packaging of brine fluids used for food preservation in jarred or canned foods. You can also measure pickling fluids for food preparation. The 0-28% Salinity range covers the spectrum in which Salt will stay soluble in water. Beyond 28%, the Salt will fall out of solubility. This unit will only be able to read TOTAL Salinity. It can not differentiate the difference between Potassium Chloride versus Sodium Chloride, again, just the TOTAL percentage of Salinity in a fluid. All RHS models use ambient light, no battery or power source is required. Models with the “ATC” suffix are equipped with “Automatic Temperature Compensation” for accurate measurements without recalibration after shifts in ambient working temperature (field use). This unit is not suggested for Salinity testing for marine environments! Please check out our other Salinity Refractometers at our eBay Store! This model sells for $249.95 and up at most retailers (when you can find them!). Get yours today at Wholesale prices! Need more units? Give us a Call or check out our eBay Store! This is out business, not our Hobby! Looking for other SALINITY REFRACTOMETERS? Other types of Refractometers entirely? pH Meters? Please check out our eBay Store! National Industrial Supply 30777 Rancho California, # 891420 Temecula, CA 92589, USA: 951.308.9269 Fax: 310.733.5480 E-mail: nisupply@ gmail.com We accept Paypal too! ------------------------------