Comparison of a digital and an optical analogue hand-held refractometer for the measurement of canine urine specific gravity.

The article presents a study on the comparison of an optical analogue and digital hand-held refractometer for canine urine specific gravity measurement. The study made use of the freezing point depression osmometer to measure urine osmolality in 50 dogs. The result of the study shows that there was a clinically significant difference between the two refractometers.