Item Description: "REFRACTOMETER LEDnD" Portable Refrigeration Oil Refractometer with Internal Light PERFECT FOR PROFESSIONALS! REFRACTOMETER LEDnD Specs: Refractive Index Scale: * Scale Range: 1.435-1.520 nD * Divisions: 0.001 nD * Accuracy: +/- 0.001nD% Included are: (1) 1.8ml Vial of 1.442nD Calibration Standard, a pipette for dropping test fluids onto the prism, (3) 1.5 Volt Button Cell Batteries and a Users Guide, durable plastic hard case. Calibration: Calibration can be done turning the Calibration Knob on the top of the unit using our 1.442 Refractive Index Calibration Fluid. A 1.8ml vial of Calibration Fluid is $18.99 per vial (amber color with an applicator rod in the cap). THIS UNIT COMES WITH THE FLUID! Ours comes with a THREE YEAR WARRANTY! One BRAND NEW REFRACTOMETER LEDnD Hand held Refractometer in a blue, foam-lined hard case. The REFRACTOMETER LEDnD uses ambient light, no battery or power source is required. This unit is a precision optical instrument that allows for the rapid and accurate determination of the refractive index of liquid solutions. It will specifically assist in determining the percent residual of oil remaining in a refrigeration system when converting it to a new refrigeration oil. Such retrofits require converting the mineral oil to a polyol ester (POE) or polyalkylene glycol (PAG), an alkylbenzene lubricant (Zerol) to a POE, or a mineral oil to an alkylbenzene. International Shipping: World via USPS Global Priority is $15.00, $12.00 to Canada For LARGER orders, please check out our Store! We have as many as you need! Click the Tag------ or go to www.nisupply.com When you can find this item, it generally sells for $499.95 and up at most retailers. Get yours today at Wholesale prices! Other types of Portable Refractometers are available through our Store! You can always get to our Store via www.nisupply.com too. Calibration Fluid: $18.99 for a 1.8ml vial of 1.442 Refractive Index Fluid. THIS UNIT COMES WITH THE CALIBRATION FLUID...! National Industrial Supply 30777 Rancho California #891420 Temecula, CA 92589, USA Sales: 951.308.9269 Fax: 310.833.7306 We prefer Paypal! Froo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, Marketing, listing Apps, Apps, Application After purchasing, pay instantly with your credit card through PayPal!