Atago 3741 PEN-Urine S.G., Digital Dip Style Urine Specific Gravity Refractometer, PEN Series, Urine Specific Gravity : 1.0000 to 1.0600 Measurement Range

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One step closer to maximum efficiency 

The Digital Hand-Held Urine Specific Gravity "Pen" Refractometer PEN-URINE S.G. utilizes the refractive index method to measure the specific gravity of urine. The PEN type refractometer is extremely easy to use. There are 2 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.


ModelPEN-Urine Specific Gravity
ScaleUrine Specific Gravity
Measurement RangeUrine S. G. : 1.0000 to 1.0600
ResolutionUrine Specific Gravity. : 0.0001
Measurement AccuracyUrine Specific Gravity. : ±0.0010
Temperature compensation range10 to 40°C (Automatic Temperature Compensation)
Ambient Temperature10 to 40°C
Measurement Time2 seconds
Power Supply1 × AAA Batteries
International Protection ClassIP65 Dust-tight and Protected against water jets.
Prism head IP67 Dust-tight and Protected against the effects of temporary immersion in water. Measurement Time2 seconds
Dimensions & Weight16×3.8×1.8cm, 70g
(Main Unit only)

* Calibration Certificate : Contact an ATAGO representative for details.


Patent for Design Registration No. ZL200830008615.4 (China), D127363 (Taiwan)
Patent Granted in countries around the world.

Call 01463 830401 For Any Assistance

One step closer to maximum efficiency

RD=\frac{\rho_{\text{substance  }{\rho_{\text{reference  }
RD=relative density
\rho_{\text{substance  =the density of the substance being measured
\rho_{\text{ reference  =The density of the reference

Relative density, or specific gravity, is the ratio of the density of a substance to the density of given reference material. Specific gravity for liquids is nearly always measured with respect to water at its densest; for gases, the reference is air at room temperature.

New Continuous Measurement feature to expand your current measuring methods.
Fast Measurements ! Non-homogeneous samples - no problem!

Stir the sample while taking continuous measurements until the readings become stable
Easy Continuous Measurements!

Once the START key is pressed, measurements are taken every second


Ergonomically designed for one-handed operation.Protection class of the PEN is IP65 (Prism head IP67). You can rinse off the sample by running water on the prism. The design allows the user to easily wipe off the sample.
The Automatic Temperature Compensation function of the PEN enables you to take measurement readings regardless of the ambient temperature.Revolutionary new feature ELI*
*External Light Interference (ELI) - Patent Pending.
Convenient Storage case.High temperature sample can be measured.
*Do not dip the instrument directly into a boiling pot to measure; instead, place the liquid in a separate container and measure.

    • Weight
      465 g
    • SKU
    • UPC/ISBN
    • Commodity Codes
  • Measurement Range
    Urine Specific Gravity : 1.0000 to 1.0600
  • Resolution
  • Measurement Accuracy
  • Ambient Temperature (°C)
    10 to 40
  • Use
    Urine (Specific Gravity)
  • International Protection Class
    IP65, Prism Head is IP67
  • Manufacturer
    Atago Co Ltd
  • Country of Origin

Always have a constant taste!

Seasoning / soy sauce / sauce / soy milk / Sauce / jam / honey / bean paste syrup / oil / fat etc.

Active in quality stability!!

Fruit drink / soft drink Carbonated drinks

Eating out When stewed To check the end point!

Ramen soup / Mentsuyu Sauce / bowl sauce, etc.

To determine the harvest time!

Fruit / vegetable / leaf juice Stem juice / root juice

Pickling liquid and seawater For concentration check!

Saline / seawater / pickle preparation liquid 
Metal Processing
Of cutting oil For concentration control!

Chemical Of various solutions For refractive index management!

Cleaning solution / antifreeze solution / brine solution Snow melting agent / cosmetics

Urine specific gravity, serum protein For inspection!

Urine / serum
※There is also a scale for clinical use.