Reichert Refractometer Duochek (F) 137584L0 is one of the many quality laboratory and scientific ... products we have to offer at very competitive pricing. Reichert Refractometer Duochek (F) 137584L0 / ... 55611-002 is part of a wide selection of Reichert Bench refractometers or polarimeters. Combining ... excellent quality with an affordable price, the Reichert Refractometer Duochek (F) 137584L0 / 55611-002 ... and accurately determine freeze protection and percent concentration of engine coolants, battery ... direct readings of ethylene glycol, propylene glycol, and battery electrolyte with only a few drops ... are sealed and cannot be contaminated. Six measurement scales. No batteries or power cord required.