User Manual

Apogee MQ series quantum meters are designed for spot-check measurements, and calculation of daily light
integral (DLI; total number of photons incident on a planar surface over the course of a day) through the built-in
logging feature. To accurately measure PFFD incident on a horizontal surface, the sensor must be level. For this
purpose, each MQ model comes with a different option for mounting the sensor to a horizontal plane.
The AL-100 leveling plate is recommended
for use with the MQ-500. To facilitate
mounting to a cross arm, the AM-110
mounting bracket is recommended for use
with the AL-100. (AL-100 leveling plate
pictured)