Atago 3733 PEN-RI, Digital Dip Style Refractive Index Refractometer , PEN Series, Refractive Index (nD) 1.3200 to 1.5100 Measurement Range

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One step closer to maximum efficiency 

The PEN-RI has a measurement range of Refractive Index (nD) 1.3200 to 1.5100 which can be used to measure almost any sample.  

ScaleRefractive Index
Measurement RangeRefractive Index (nD) : 1.3200 to 1.5100
Temperature : 10.0 to 100℃
ResolutionRefractive Index (nD) : 0.0001
Temperature : 1℃
Measurement AccuracyRefractive Index (nD) : ± 0.0003 (water at 20 ℃)
Temperature : ±1℃
Ambient Temperature10 to 40°C
Measurement Temperature10 to 100°C
Measurement Time2 seconds
Power Supply1 × Size AAA alkaline battery
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.
Dimensions & Weight16×3.8×1.8cm, 70g (Main Unit only)

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

  • £515.00

One step closer to maximum efficiency

In optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as n={\frac {c}{v , where c is the speed of light in vacuum and v is the phase velocity of light in the medium.

n=refractive index
{c}=speed of light
{v}=phase velocity of light
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.

    • SKU
    • Commodity Codes
  • Measurement Range
    Refractive Index (nD) : 1.3200 to 1.5100
  • Resolution
  • Measurement Accuracy
    Refractive Index (nD) : ± 0.0003 (water at 20 ℃)
  • Measurement Temperature (°C)
    10 to 100
  • Ambient Temperature (°C)
    10 to 40
  • Use
    Refractive Index
  • 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.