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 PP Systems CFLUX-1 Automated Soil CO2 Flux System Learn More Hansatech Instruments FMS-300 Pulse Amplitude Modulated (PAM) Fluorometer Learn More Qubit Systems S104 DOX Differential O2 Analyzer Learn More Regent Instruments WinSEEDLE Learn More