SpectraPen SP 110 Photon Systems Instruments Categories Crops , Photosynthesis, Chlorophyll & Respiration Brochure Send Enquiry Overview PSI SpectraPen SP 100 a handheld, programmable spectrophotometer that provides instant readings and spectral lines on interactive touch screen. Applications include visible light source testing, color measurement and chemical measurement. Back Our Related Products Soil Moisture G4 Sealing Sleeves Learn More Photon Systems Instruments FytoScope Chamber FS 130 Learn More Soil Moisture G4 Brass Support Washers Learn More Spectrum Technologies Macroscopes Learn More