Multi-Wavelength Abbe Refractometer. Refractive index or Abbe number (νd or νe) can be measured at different wavelengths ranging from 450 to 1,100nm (For measurement at wavelengths ranging from 681 to 1,100nm, the Optional Near Infrared Ray Viewer (RE-9119) is required.The DR-M4 displays measurement result of refractive index or Abbe number digitally on the LCD.Measurement can be achieved by matching the boundary line with the intersection point of the cross hairs.
| Model | DR-M4 | Cat.No. | 1414 |
| Measurement range | Refractive index : 1.5219 to 1.9218 (at 450nm) Refractive index : 1.4700 to 1.8700 (at 589nm) Refractive index : 1.4545 to 1.8543 (at 680nm) Refractive index : 1.4260 to 1.8258 (at 1,100nm) |
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| Accuracy | Refractive index : ±0.0002 (With the attached test piece at 500 to 650nm) |
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| Minimum Indication | Refractive index : 0.0001 Abbe number : 0.1 |
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| Measurement Temp. | 5 to 50ﾟC | ||
| Dimensions & Weight | 13×29×31cm, 6.0kg (Refractometer) 15×33×11cm, 3.2kg (Light source unit) |
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| Wavelength Range | From 450 to 1100nm (with interference filters) (For measurement at wavelengths ranging from 681 to 1100nm, the Near Infrared Ray Viewer (Optional is required) |
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| Display Panel / Light Source | LCD / Halogen lamp, 12V 50W | ||