MK350S 1 of 3
MK350S 2 of 3MK350S 3 of 3AWARD_BAR_UPRTEK

UPRtek MK350S Advanced Spectrometer Illuminance Light Meter


The MK350S is a lightweight, portable, easy to operate Spectral Illuminance (LUX) Meter or Spectral Light Meter.  It is designed for spectral illuminance measurements of general lighting, horticulture/agriculture lighting, and LEDs.  Designed to be intuitive and user friendly, it is versatile and ideal for measuring general light metrics such as LUX, CCT, CRI, CIE 1931, Ra, R1 to R15, Wavelength, PPFD & PAR and many others.  Uniquely, the MK350S also includes an integrated CCD camera to give an additional visual view to display the feeling of lighting level and uniformity for the area under measurement.


  • Touchscreen control with a 3.5″ resistive touch LCD screen.
  • More than 40 units of measurement including LUX, SPD, CRI, CCT, Ra, R1 to R15, CIE 1931, u’ v’, Peak and Dominant Wavelength, and many others.
  • Stand alone Spectral Light meter – no other equipment necessary (e.g., PC, Smartphone, etc.). Built-in file browser allows for quick access to previously saved data
  • 380 to 780nm measurement range
  • NIST Traceable calibration with optional NVLAP ISO17025 certified calibration.
  • Wifi remote control via Smartphone or tablet apps (IOS and Android)
  • Visual aim & click display (on-screen viewport) – No more blind measurements
  • Automatic continuous measurements with data-save to an SD card
  • Illumination distribution charts provide assistance in fixture design
  • Easy, on-the-spot data comparison features – Comparing  different lamps/LEDs or comparing against historical data
  • Maximum and minimum acceptable ranges for evaluating LED quality
  • 2-year product warranty
  • Package Contents: MK350S LED Meter, hard case, protection bag, battery, USB cable, power adapter, neck strap, tripod/stand bracket, User Manual & Warranty booklet
Sold by Gamma Scientific as the exclusive distributor of UPRtek Handheld Spectrometers in the U.S. and Canada.


Need help? Contact us:
800-637-2758 :


The Advanced MK350S is specially designed
for lighting designers and manufacturers with the
aim to improve production efficiency and to increase product quality.

CCT, LUX, CRI, CIE1976, CIE1931,
PPF, CQS, Duv, LambdaP, S/P ratio, TLCI, GAI, and many others
The Advanced MK350S has more than 40 light measurement
functions for further analysis and research
to meet the needs of lighting experts.

The Advanced MK350S has a Basic List display feature that can be
customized with 5 items from the list of light measurement functions to make your job easier.

The LUXG function is a unique feature that gives a visual representation of light distribution in a scene.
The space design professional can use this visual language
to explain the lighting shape and form to illustrate the feeling of lighting level and uniformity.

The BIN mode classifies Lamps, Luminaries, and LEDs using a built-in ANSI C78.377 binning standard.
BIN ranking can also be customized by loading a new BIN chart
to fulfill specialized BIN ranking requirements.

The Compare feature allows
users to compare measurements side by side
or to check against historical data.

How long and how much data should I measure?
What should be the interval of each measurement?
Just setup your needs on the MK350S!

Quality Checker Mode
1. Customize the units you wish to measure.
2. Setup the range.
3. Measure and read the result.

Pass or Fail,
Product quality checks are quick and easy!

Measures Photosynthetically Active Radiation (PAR) for greenhouse plants.
Displays Photosynthetic Photon Flux Density (PPFD) measurements
for grow lights used in horticulture/agriculture industries.
MK350S spectroscopic accuracy is superior to that of a quantum meter.

Blue Light can be found from a variety of sources such as sunlight ,LEDS, TV, and computer monitors. Blue light is also referred to as HEV (high-energy visible) light and is suspected to cause cell damage in the retina and age-related macular degeneration (AMD). The MK350S Transmit function can easily reveal HEV light to guard against these health concerns. The MK350S Transmit function can easily reveal HEV light to guard against these health concerns.

The Advanced MK350S Handheld Spectrometer’s
standalone operation measures anytime and anywhere,
eliminating the need to connect with your PC or mobile phone.
Use iOS and Google Play App
Plus WiFi wireless remote control capability
uSpectrum PC software system is the best tool for data analysis!

Additional Information

Weight5 lbs
Dimensions2 x 3 x 5 in


SensorCMOS Linear Image Sensor
Wavelength Range380 to 780 nm
Wavelength Data Increment1 nm
Spectral BandwidthApproximately 12 nm ( Half Bandwidth )
Wavelength Reproducibility± 1 nm *1
Measurement Range1 to 100,000  lx
Illuminance AccuracyIlluminant A @ 2,856 K at 20,000 lx± 5%
Color Accuracy± 0.0025 in CIE 1931 x,y
Color Repeatability± 0.0005 in CIE 1931 x,y
CCT Accuracy± 2%
CRI Accuracy @ Ra± 1.5%
Stray Light-25 dB max. *2
Integration Time Range6 to 5,000 ms
Digital Resolution16 bits


Capture FunctionOne time / Continuous
Operation ModeStandalone Mode / WiFi Mode*3 / USB Mode ( MSC Mode + PC connection)
Integration ModeAuto / Manual
Measuring Modes1. Basic Mode
2. Spectrum Mode
3. CRI Mode
4. CIE 1931 / 1976 Chromaticity Mode
5. LUX Image Distribution Mode
6. Log Mode
7. BIN Chart Mode
8. Quality Control Checker Mode
9. Measurement Comparison Mode
10. Transmit Mode
11. TM-30-15 Mode
12. Data Browser Mode
13. Option Mode
Measuring Capabilities1. Illuminance ( LUX ) / Foot Candle ( fc )
2. Correlated Color Temperature ( CCT )
3. CIE Chromaticity Coordinates
 (1) CIE 1931 x,y Coordinates
 (2) CIE 1976 u’,v’ Coordinates
 (3) CIE 1931 XYZ Value
4. △x , △y , △u’ , △v’
5. Delta uv ( Duv )
6. Dominant Wavelength ( λd )
7. Excitation Purity
8. BIN ANSI C78.377 or Customized
9. Standard Deviation Color Matching ( SDCM )
10. Color Rendering Index  ( CRI , Ra)/ R1 ~ R15
11. Color Quality Scale ( CQS )
12. Gamut Area Index ( GAI )
13. Television Lighting Consistency Index ( TLCI )
14. TM-30-15 ( Rf, Rg )
15. Photosynthetically Active Radiation ( PAR )
(1) PPFD ( 400nm ~ 700nm )
(2) PPF-UV ( 380nm ~ 400nm )
(3) PPF-B ( 400nm ~ 500nm )
(4) PPF-G ( 500nm ~ 600nm )
(5) PPF-R ( 600nm ~ 700nm )
(6) PPF-NIR ( 700nm ~ 780nm )
16. Spectral Power Distribution ( SPD )
17. Peak Wavelength ( λp )
18. Peak Wavelength Value ( λpV )
19. Intergration Time ( I-Time )
20. Scotopic and Photopic Ratio ( S/P )
21. Transmittance

System Configurations

Display4.3″ 800X480 Resistive Touch LCD
Max. Files≒ 21,000 Files @ 8GB SD Card ( Excel + JPG )
Battery Operation Time≦ 4 hours / Fully Charged
PowerAdapter; 2500 mAh /  3.7V Rechargeable Li-ion Battery
Data Output InterfaceSD Card ( SD2.0 , SDHC / up to 32G ) /  Mini USB Port ( USB 2.0 )  / WiFi SD Card compatible with iOS and Android
Data FormatCompatible Excel / JPG
Dimensions163 x 81 x 26.6 mm ( H x W x D )
Weight (with Battery)255 g ± 10 g
Operating Temperature0 ~ 35 ℃
Storage Temperature-10 ~ 40 ℃
Display languagesEnglish / Traditional Chinese / Simplified Chinese / Japanese/ Spanish / German / French / Italian / Russian
Camera Resolution2M pixels
Cosine Correction
*1:Input source must be a stable light source.
*2:Input the 550nm monochromatic light and measure the stray light ratio at 550nm ± 40nm.
*3:It can be connected to mobile phones and tablet computer.The company reserves the right to change product specifications at any time without prior notice.

Product Warranty

Duration of Warranty2 years

Pin It on Pinterest