Refractive Index Refractometer, nD Mineral Oil with Internal Light

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! 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