Apogee Instruments MQ-610 ePAR Meter with SensorApogee's newest, cutting edge ePAR sensor was created in 2021 as an upgrade to our ePFD sensor and designed to measure the newly defined 400 750 nm ePAR radiation range that research has shown to be photosynthetically active, beyond the traditional 400 700 nm range. Typical Applications Total ePAR intensity measurements over plant canopies in all growing environments Monitor and adjust grow lights Research plant morphogenic activity Photobiology