The MQ-610 ePAR Meter from Apogee Instruments is a research-grade tool designed to accurately measure extended photosynthetically active radiation (ePAR) across the 400–750 nm spectrum. Unlike traditional PAR meters that measure only 400–700 nm, the MQ-610 captures far-red photons (700–750 nm) emitted by modern LED grow lights and sunlight, providing a more complete understanding of plant-usable light. Just like the brand’s MQ-500 Quantum Meter and MQ-200X Quantum Meter, the MQ-610 ePAR Meter from Apogee Instruments offers spot, sample, and logging modes to monitor light intensity and calculate daily light integral (DLI). With ±5% calibration uncertainty, minimal long-term drift, and rugged construction for demanding environments, the MQ-610 delivers reliable, research-grade light measurements for greenhouses, growth chambers, and controlled environment agriculture.