Whiteness Meter NWNM-200

Whiteness Meter NWNM-200

Whiteness Meter NWNM-200 adopted with the principle of photoelectric effect for measurement and whiteness calculation formula of the instrument is blue light whiteness R457. Built in with optical system, display system, detection system, data process and light source. Optical cell received the diffuse reflectance radiant brightness energy value of the sample surface. High-precision auto zeroing operation amplifier, amplified the value of sample surface and for energy calibration it is inputted to the calibration circuit. The whiteness value of the sample is directly shown on the display. It is used to measure the whiteness value of powder or object with flat surface.


Range 0 to 120 unit
Resolution 0.1 unit
Illumination Condition 45/0
Illuminant LED 457 nm
Whiteness Formula Blue Light Whiteness WB=R457
Measuring Aperture ≤ 15 mm
Zero Drift ≤ 0.1
Stability Of Display ≤ 0.5
Repeatability Of Measurement ≤ 0.1
Ambient Temperature 0 to 40°C
Temperature Humidity < 85% RH
Power Supply 4×1.5 V AAA (UM-4) Battery (Optional AC Power)
Unit Dimension 156×67×28 mm
Probe Dimension Ф 44×55 mm
Weight 200 g (Not Including Batteries)


  • Long-life LED display with 457 nm
  • Use of high quality imported components
  • Designed with simple and reasonable optical path
  • No pre-heating after starting
  • Whiteness value of the sample is directly shown on the display
  • Easy to operate, after simple calibration measurements can be taken
  • Pass strict testing and inspection
  • Stores up to 254 groups measurement data
  • Connection with PC using RS-232 data output
  • Built in with Bluetooth data output of choice


Whiteness Meter is widely used in whiteness measurement of white cement, enamel, ceramics, detergent, chemical construction materials, paper board, plastic products, dyeing, paint and textile printing and dyeing, paint. It is also used in food and cosmetic industries for flour, salt, starch, talc powder and other substances.

Standard Accessories

Accessories No. Accessories Name
1. Main Unit
2. External Probe
3. Standard White Board
4. Optical Cleaning Cotton Cloth
5. Carrying Case (B04)

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