Designed in 2006, PhytoFlash has become too expensive a product to manufacture and still offer at a reasonable price so we obsoleted it effective September 1, 2018.  If you have interest in a low-cost Active Fluorometer and can use a handheld instrument, please take a look at our AquaFlash which provides accurate estimations for total chlorophyll and photosynthetic efficiency in less than 15 seconds.   We are offering PhytoFlash owners a trade-in discount toward the purchase of an AquaFlash.  To take advantage of the PhytoFlash Trade-In Program please complete our AquaFlash Handheld Active Fluorometer quotation request form and indicate the serial number of the PhytoFlash you wish to trade in.