The Atago PEN-Urine S.G. is a handheld, pen style digital Refractometer that measures the Specific Gravity (S.G.) of human urine to determine hydration levels. 


This new "Pen" style digital Refractometer has been developed for fast and hygienic use when testing urine to determine hydration. Handling is minimal; there is no need to pipette the sample onto the  test prism any more. 

To use, just simply dip the tip of the refractometer into the specimen sample pottle and press the start button for quick, automatic measurement.

Clean up is also quick and easy as the pen-urine Refractometer is IP65 rated and can be rinsed under running water. 



Using a refractometer is widely accepted as a standard method for monitoring and ensuring safe hydration levels are maintained.

Perfect for use on site to perform regular employee safety testing as well as drug and alcohol screening, forming a vital part of your OH & S program.


Urine specific gravity results will fall between 1.002 and 1.030 if your kidneys are functioning normally. Specific gravity results above 1.010 can indicate mild dehydration. The higher the number, the more dehydrated you may be.



Many sporting clubs, both amateur and professional use the Atago Pen-Urine S.G for measuring and monitoring the hydration of athletes.  Chances are the team you support is using one of these refractometers.

Not only is hydration a concern in sports, for many work places poor hydration can be a cause of work place accidents.  For effective OHS policy many organisations use the refractometers to ensure workers are turning up to work hydrated and not suffering from the effects of a big night.  Other OHS concerns include ensuring workers maintain hydration whilst on the job.  This is especially critical at mine sites and building sites.

Effects of dehydration can include fatigue, weakness, palpitations, dizziness, confusion, fainting and breathing difficulty.  These effects can cause an individual to either have, or contribute to a major accident and in mild cases cause a lack of productivity.  

For such a simple to use piece of equipment, the benefits are enormous.


  • Very easy to use with instantaneous, automatic measurement
  • Extremely high accuracy to 0.0010 S.G.
  • IP65 casing means it can be cleaned under running water quickly & easily
  • Zero calibration with distilled water
  • Automatic Temperature Compensation (ATC) for increased accuracy
  • Sealed unit, no user maintenance required



Measuring Range 1.0000 to 1.0600 S.G.
Resolution 0.0001 S.G.
Accuracy ±0.0010 S.G.
Temperature Compensation 0°C to 40°C
Power Supply 1 x AAA Battery
Dimensions 160mm x 38mm x 18mm
Weight 70 grams



Model # 3741
Brand Atago
Shipping Weight 0.2000kg
Shipping Width 0.168m
Shipping Height 0.018m
Shipping Length 0.038m
Shipping Cubic 0.000114912m3
Unit Of Measure ea

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