Final answer:
A refractometer is the most reliable and reproducible method for determining specific gravity, offering precise measurements over other methods like reagent strips, chemistry analyzers, and urinometers.
Step-by-step explanation:
The most reliable and reproducible method for determining specific gravity is using a refractometer. A refractometer provides precise measurements by measuring the bending of light as it passes through the urine sample, correlating to the density of the sample.
Other methods like reagent strips, chemistry analyzers, and urinometers offer varying degrees of accuracy and reproducibility. Reagent strips rely on color changes and are subject to interpretation errors due to read time.
Chemistry analyzers, while accurate, may not be as accessible as refractometers. Urinometers are sensitive to temperature changes and less precise compared to refractometers.