The PG100N by UPRtek is a handheld spectrophotometeris designed to be lightweight, easy-to-use and portable. Designed for fast and accurate light measurement, a built-in touch screen, makes taking Photosynthetic Photon Flux Density (PPFD) readings easier than ever before. Couple this with an extension cable to take readings with in controlled environments, the PG100N is perfectly suited for field and laboratory use.