The Digital Hand-Held Urine Specific Gravity “Pen” Refractometer PEN-URINE S.G. utilises the refractive index method to measure the specific gravity of urine. The PEN type refractometer is extremely easy to use.
There are two ways to measure the sample : Dip the tip into the sample and press the START key OR press the START key and touch the tip into the sample.
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