The Quantum LGBQM PAR (Photosynthetically Active Radiation) meter measures flux in wavelengths ranging from the 400 to 700 nm. This highly accurate portable PAR meter measures up to 10,000 in units of micro-mol per meter squared per second and tethers to computers via USB cable for easy data logging. This Quantum PAR meter offers data logging capability using a standard mini-USB cable and proprietary data logging software available at hydrofarm.com. Meter works very efficiently with built-in low battery power indication. Includes carrying case, booklet with lighting recommendations, and batteries.