Matt W Chemist BRS Member Feb 21, 2016 #1 Long time coming! http://https://reefbuilders.com/2016/02/19/apogee-sq-mq-500-quantum-meter-par-sensor/
Long time coming! http://https://reefbuilders.com/2016/02/19/apogee-sq-mq-500-quantum-meter-par-sensor/
s_kelley Well-Known Member Moderator BRS Member Feb 21, 2016 #2 Link won't work, Here https://reefbuilders.com/2016/02/19/apogee-sq-mq-500-quantum-meter-par-sensor/