MQ-200X Quantum Separate Sensor with Handheld Meter

ORIGINAL SUNLIGHT QUANTUM METER - Designed by world-renowned crop physiologist, Bruce Bugbee, PhD, the Apogee MQ-200X "original" quantum meter features Apogee's older and more economical photodetector that is excellent for measuring photosynthetically active radiation (PAR) accurately under sunlight, metal halide, and high-pressure sodium lights. For measuring other light sources, including LEDs, we recommend using our newer full-spectrum or ePAR sensors. FOR SCIENTISTS & SERIOUS GROWERS - Unlike cheaper LUX or footcandle sensors which are sometimes marketed as grow light meters, but are meant for measuring light for human vision, our meters feature a laboratory-grade photosynthetic photon flux density (PPFD) optical detector precisely calibrated to measure the light intensity in µmol m-2 s-1 of the specific color wavelengths emitted by sunlight, MH, and HPS lights that are used by plants for photosynthesis. ACCURATE & STABLE CALIBRATION - The meter combines the intensity of al