United Power Research Technology Corp.


Handheld Spectrometer

MK350S Handheld Quantum Meter Uprtek 

Advanced MK350S special designed
for lighting designers and manufacturers
Aim to improve the production efficiency and increase the product quality

CCT, LUX, CRI, CIE1976, CIE1931
PPF, CQS, Duv, LambdaP, S/P ratio, TLCI, GAI...
Advanced MK350S had more than 40 light measurement units
for further analysis and research
to fulfill the need of lighting experts

MK350S has 5 lighting basic measuring features
Additional 5 customized lighting application mode
To make you lighting measuring job easier

LUXG provide LUX image distribution of the scene
The space design professional can use the visual language
to explain the light shape, form and lines of objects which is abstract
and illustrate the feeling of lighting level and uniformity

LED BIN rating application mode
Built-in ANSI78.377 and MacAdam Ellipse
Additional BIN customized function is also designed
To fulfill specialized LED design field

Measurement compare mode
Users may measure and compare the light side by side
or check against historical data
Plus color management to compare the difference

How long and how many data should I measure?
What interval of each measurement?
Just setup your needs on MK350S
Feel free and spend your time to life!

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 check is easy

Advanced MK350S handheld spectrometer
No need to connect with PC or mobile phone
Standalone operation to measure at any time
iOS and Google play APP
Plus WiFi wireless remote control capability
Create a no boundary line to measure
uSpectrum PC software system the best tool for data analysis


Sensor CMOS Linear Image Sensor
Wavelength Range 380 to 780 nm
Wavelength Data Increment 1 nm 
Spectral Bandwidth Approximately 12 nm (Half Bandwidth)
Wavelength Reproducibility ± 1 nm *1
Measurement Range 1 to 100,000  lx
Illuminance Accuracy Illuminant A @ 2,856 K at 20,000 lx *2 ± 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. *3
Integration Time Range 3 to 20,000 ms
Digital Resolution 16 bits 
Capture Function One time/Continuous
Operation Mode Standalone Mode/WiFi Mode*4/USB Mode (MSC Mode *5+ PC connection)
Integration Mode Auto/Manual
Measuring Modes 1. 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. Browser Mode
13. Option Mode
Measuring Capabilities 1. 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 to R15
11. Color Quality Scale (CQS)
12. Gamut Area Index (GAI)
13. Television Lighting Consistency Index (TLCI)
14. TM-30-15 (Rf, Rg, Color Vector Graphic) 
15. Photosynthetically Active Radiation (PAR)
(1) PPFD (400 to 700nm) µmol/m2/sec
(2) PPF-UV (380 to 400nm) µmol/m2/sec
(3) PPF-B (400 to 500nm) µmol/m2/sec
(4) PPF-G (500 to 600nm) µmol/m2/sec
(5) PPF-R (600 to 700nm) µmol/m2/sec
(6) PPF-NIR (700 to 780nm) µmol/m2/sec
16. Spectral Power Distribution (SPD) mW/m2
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
Display 4.3" 800X480 Resistive Touch LCD
Max. Files ≒ 21,000 Files @ 8GB SD Card (Excel + JPG)
Battery Operation Time ≦ 4 hours / Fully Charged
Power Adapter; 2500 mAh (3.7V Rechargeable Li-ion Battery)
Data Output Interface SD Card (SD2.0,SDHC/up to 32G)/Mini USB Port (USB 2.0)/WiFi SD Card compatible with iOS and Android
Data Format Compatible Excel/JPG 
Dimensions 163 x 81 x 26.6 mm (H x W x D)
Weight (with Battery) 255 g ± 10 g
Operating Temperature/Humidity 0 to 35 ℃, relative humidity 70% or less without condensation
Storage Temperature/Humidity -10 to 40 ℃, relative humidity 70% or less without condensation
Display languages English/Traditional Chinese/Simplified Chinese/Japanese/Spanish/German/French/Italian/Russian
Camera Resolution 2M pixels
Cosine Correction
*1:Input source must be a stable light source.
*2 :Temperature 23±2℃ and relative humidity 50% or less.
*3:Input the 550nm monochromatic light and measure the stray light ratio at 550nm ± 40nm.
*4:It can be connected to mobile phones and tablets.
*5:MSC- Mass Storage Class.

The company reserves the right to change product specifications at any time without prior notice.


2013 Aurora Award
2014 Taiwan Excellence

Optional Accessory

Applicable Industry

Light and Agriculture
Health and Safety
LED Screens
LED Professionals
Lighting Designers
Road and Traffic
Store Display