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 Qubit Systems Q-G266 Flow Monitor 1L Learn More OptiSciences OS30p+- Hand Held Chlorophyll Fluorometer Learn More Soil Moisture Complete G4 Sleeve Kit Learn More Spectrum Technologies LightScout 3 or 6 Sensor Quantum Bars Learn More