... fluid Refractometer, Digital Refractometer Pocket Type digital refractometer: The digital refractometers have the following characters:Automatic Temperature CompensationAutomatic Shut Off after ... design, our new Pocket Type digital refractometers will offer more accurate testing. All our digital refractometers have the following characters:MODELSCALESRANGEDIVISIONSACCURACYCarPDR503FPropylene Glycol32 ...