$199.99 NISupply Refractive Index Refractometer, nD POE AB Mineral Oil w/ Internal Light

Item Description: "REFRACTOMETER LEDnD" Portable PERFECT FOR PROFESSIONALS!  This accurate and simple-to-use NI Supply refrigeration oil refractometer can determine the amount of oil remaining in a refrigeration system when converting it to a new refrigeration system. Model can identify lubricant residuals by measuring the refractive index. Device can be field calibrated prior to each test.• An essential tool for retrofitting AC/R systems it simplifies the procedure and eliminates the guesswork• Identifies lubricant residuals by measuring refractive index• Can be calibrated in the field prior to each test• Accurate and Efficient 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 turni