What are Low Stray light spectrometer from Optosky?

ATP4XXX belongs to low stray light spectrometer.
ATP4230 concave grating focus=86mm
ATP4020 concave grating, focus=137mm, NA=0.073
ATP4050 concave grating, focus=137mm, NA=0.182
ATP4070 concave grating, focus=137mm, NA=0.255

How many topology structure of optical path for a spectrometer?

There are commonly divided into 4 types of optical path, including crossed C-T, M-shape C-T, concave grating optical path, transmittance grating opitcal path.
Crossed C-T: ATP2000P,ATP2002, ATP2400, ATP1010, ATP5020P, ATP5040, ATP6500
M-shape C-T: ATP3030, ATP3034, ATP3330/4 ATP5030, ATP5034, ATP5330/4 
Concave grating: ATP4230, ATP4020, ATP4050, ATP4070
let's see the M-shape optical path looks like a number "3", so our models uses the 3rd number "3" to indicate M-shape optical path models.
In generally, topology structure can decide resolution, sensitivity, stray light, and size of a spectrometer.
Crossed C-T topology structure employs better sensitivity and compact size.
M-shape C-T employs higher resolution and better stray light.
Concave grating optical path employs high stray light.

What are application of spectrometers?

1st, Environmental industries:
UV smoke analysis
Multi-parameters online water quality analysis
No reagenet online water quality analysis
2nd, Industrial Inspection:
Colorimeter, colors sorting
Emissivity,Transmittance Measure
Laser wavelength monitor
LED color temp sorting
Film thickness measure meter
Glass thick measure meter
Process Analysis Technology(PAT)
3rd, Biomedical industries:
Fully automatic biochemical analysis
Fluorescence Spectroscopy
4th, Scientific instrument
Fluorescence Spectroscopy;
Chemical Lighting
LIBS or Ionoluminence
Liquid Chromatogram

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