Atago 1230 NAR-3T Abbe Refractometer, Refractive index (nD) : 1.30000 to 1.71000 Measurement Range, ±0.0001 Accuracy



ScaleRefractive index
Measurement RangeRefractive index (nD) : 1.30000 to 1.71000
Brix : 0.00 to 95.00%
Minimum ScaleRefractive index (nD) : 0.0002
Brix : 0.1%
Measurement AccuracyRefractive index (nD) : ±0.0001
Brix : ±0.05%
Average dispersion valuenF - nC (to be calculated according to conversion table)
Ambient Temperature5 to 40゚C
Digital ThermometerIndication range : 0.0 to 50.0゚C
(Accuracy : ± 0.2゚C, Minimum indication : 0.1゚C)
Measurement Temperature Range5 to 50゚C
(Temperature range available of the circulating water)
Light sourceLED (Approximating to wavelength of D-Line)
Power SupplyAC100 to 240V , 50/60Hz
Dimensions & Weight12×31×34cm, 9.0kg(Refractometer)
10×11×7cm, 0.5kg (Thermometer)
Power consumption5VA
Special Order Option : The sample stage height can be customized.


  • Monobromona-phthalene as contact liquid : RE-1196
  • Methylene iodide containing sulfur solution : RE-1199
  • Eyepiece for polarizing : RE-1146
  • * Calibration Certificate : Contact an ATAGO representative for details.
  • * As for the other consumables & the part please view this.
  • *Please inform us of a serial number in the case of an order.
  • £6500.00

The NAR-3T is the unit with the highest degree of precision and accuracy among the Abbe Refractometers. It was developed to give improved measurement accuracy and ease of use. This was achieved by making fundamental improvements to the optical system and utilizing a larger scale, which allows for refractive index scale measurements of up to 0.00005. Incorporating a high-intensity lamp and using a double control knob gives quick and more accurate control.


ATAGO's Abbe Refractometers are widely used in a variety of fields; from basic research to product management.

Uses and Applications

For measuring the refractive index (nD) of liquid samples between 5 to 50˚C:
DR-A1, DR-A1-Plus, and NAR-1T LIQUID. We recommend the NAR-3T for high-accuracy measurements.
For measuring the refractive index (nD) of liquid samples up to 120˚C:
For measuring the refractive index (nD) of solid samples (glass, plastics, films, etc.):
NAR-1T SOLID, DR-A1, and DR-A1-Plus. The NAR-3T is also capable of measuring clear, translucent glass or plastics.
For measuring liquid or solid samples with a high refractive index (1.47 to 1.87):
For measuring and determining the refractive index or Abbe number of liquid or solid samples at different wavelengths:
DR-M Series: DR-M2, DR-M2/1550, DR-M4, and DR-M4/1550 (For high refractive index measurements.)
For determining average dispersion values or abbe numbers:
For measuring Brix (%):
DR-A1, DR-A1-Plus, and NAR-1T LIQUID. We recommend the NAR-3T for high-accuracy measurements.
For connecting to a printer:
DR-A1, DR-A1-Plus, and DR-M Series
For measuring birefringent (double refraction) samples (plastics, films) that have different refractive indices depending on their orientation, or for measuing the ordinary ray (n subscript null) or extraordinary ray (n subscript exponential) of liquid crystals (LCs):
DR-A1, DR-A1-Plus, NAR-1T SOLID, NAR-2T, NAR-4T, and DR-M Series

ATAGO Products Conform to ASTM Standards

  • D542 STM for Index of Refraction of Transparent Organic Plastics
  • D1045 STM for Sampling and Testing Plasticizers Used in Plastics
  • D1218 STM for Refractive Index and Refractive Dispersion of Hydrocarbon Liquids
  • D1416 STM for Rubber from Synthetic Sources--Chemical Analysis
  • D1747 STM for Refractive Index of Viscous Materials
  • D3321 STM for Use of the Refractometer for Field Test Determination of the Freezing Point of Aqueous Engine Coolants D4095 STM for Use of the Refractometer for Determining Nonvolatile Matter (Total Solids) in Floor Polishes D5006 STM for Measurement of Fuel System Icing Inhibitors (Ether Type) in Aviation Fuels
  • D5775 STM for Rubber from Synthetic Sources-Bound Styrene in SBR
    • SKU
    • Commodity Codes
  • Measurement Range
    1.30000 to 1.71000
  • Measurement Accuracy
  • Measurement Temperature (°C)
    5 to 50゚C
  • Ambient Temperature (°C)
    5 to 40゚C
  • Manufacturer
    Atago Co Ltd
  • Country of Origin