MK350D Spectrometer


The MK350D Compact model is a lightweight, pocket-sized, easy-to-operate Spectral Illuminance (LUX) Meter or Spectral Light Meter with Bluetooth remote control operation and MicroSD card storage. The unit includes a small visual display screen and integrated Flicker sensor for flicker measurements. Additionally, it has SD card storage capability and can be connected to the uSpectrumTM PC software (free download) and smartphone apps.  Designed to be intuitive and easy to use, it is ideal for measuring general light [parameters such as as LUX, CCT, CRI, CRI 1931, Ra, R1-R15, Wavelength and many others.


Precision, Power and Portability in an Ultra-Compact & Lightweight Package

  • 70g pocket size, the lightest handheld spectrometer in the world
  • Flicker measurement for determination of healthy lighting parameters
  • Stand-alone operation, no need for a smart phone or PC connection
  • Supports MicroSD card with extensive data storage
  • 27 light units-of-measure from which to choose
  • Compatible with smart devices; wireless control by Bluetooth
  • Additional uSpectrumTM PC application is available for advanced analysis



6.6 mm diameter CMOS linear image sensor

Wavelength Range

380 to 780 nm

Wavelength Data Increment

1 nm

Spectral Bandwidth

12 nm                                     (half power bandwidth)

Wavelength Reproducibility

± 1 nm                                    (assumes stable input light source)

Measurement Range

70 to 70,000 lux

Illuminance (1)


±  5%

Color (1,2)




x y: ±  0.0025 in CIE 1931 x,y


± 0.0005 in CIE 1931 x,y

CCT Accuracy

± 2%

CRI Accuracy at Ra

± 1.5%

Stray Light

-25 dB maximum                     (550 ± 40nm monochromatic source)

Integration Time Range

6 msec to 1 sec                    

Digital Resolution

16 bit



Flicker Percentage Readings

1 to 100%

Frequency Range

10 to 165 Hz


System Configuration


128 x 64 (0.19 in) monochrome OLED

Maximum Files

2,000 with 2 GB SD card, compatible with Excel® and JPG

Battery Operation

Up to 3 hours, onboard 3.7 V Li-ion

External Power

Adapter (included), 700mAh via USB connector

Data Interface

Micro SD card  (SD2.0.SDHC up to 32 GB) or  mini USB port (USB 2.0)


33 mm (1.3 in) H x 33 mm (1.3 in) W x 90 mm (3.5 in) D                       70 g (2.5 oz) including battery

Language Options

English, Traditional Chinese, Simplified Chinese, Japanese, Spanish, German, French, Italian, Russian

(Stand-alone mode in English only)

Product Features

Capture Function

One-time or Continuous       (Continuous capture not supported in stand-alone mode)

Integration Mode

Auto or Manual                       (Manual integration not supported in stand-alone mode)

Standalone Measuring Modes

CCT                                                                CRI                                                           LUX                                   ƛP

Spectrum                                                      R9                                                            FC                                     Flicker    

CIE 1931 Chromaticity Value                    CIE 1976 Chromaticity value

Measurement Data Saved to SD Card

CCT                                                                CRI  (R1-R15)                                          LUX                                   ƛP

CIE 1931 x,y coordinates                           CIE 1976 UCS u’, v’ coordinates         Flicker Percentage

(1)At 23 ± 2° C and relative humidity ≤ 50%                                                                                               Specifications are subject to change without notice.

(2)Illuminant A at 2,856 K at 20,000 lux

(3)30 Hz AC/DC 10% sine wave unless otherwise specified