A Duke for the Penniless Widow (The Irresistible Dukes Book 2)

Spectryx USBVIS Miniature CCD Spectrometer USB - SMA connectorized

VTSYIQI Horizontal Spectrophotometer Portable Spectrophotometer Paint Spectrometer with Caliber Φ11mm Accuracy 0.01 Repeatability dE*ab≤0.02 Integrating Sphere Diameter 40mm Sensor ASTM ISO Standard

Spectrometer, Handheld Spectrum Analyzer Bundle Kit for Precision Color Control, PPFD PAR CCT CRI Lux Spectrum for LED Light Tester, for Home, Plant Growth Lab & Industrial Use

Hopoocolor OHSP350IR 380-1050nm Spectrometer LED Wavelength Meter Spectrometer Handheld 1000nm with PC Software

AS7341 Visible Spectrum Infrared Color Spectrometer Sensor Module for arduino

VBR-100 Quantum PAR Meter 6000umol/(㎡s),Full Spectrum,Show Red and Blue PPFD in Light Seperately,PPFD Distribution Record

Spectrometer, Handheld Spectrum Analyzer Bundle Kit for LED Grow Lights Full Spectrum, PPFD PAR CCT CRI Lux Spectrum for LED Light Tester, for Home, Plant Growth Lab & Industrial Use

Spectrophotometer 722N Vis Photometer Wavelength 360-1000 nm (2 nm) Backlit LCD Display Spectrometer Analytical Meter