In this video tutorial, viewers learn how to use the Digital Lux meter. The meter is packed in a carrying case. Begin by removing the unit and the plastic cover from the sensor. Then install the 9V battery. This device has 3 settings and has a hold function. To use it, move the sensor underneath a light source until your receive the highest reading. It is recommended to have 8000-12000 SI for a reptile's habitat. This video will benefit those viewers who have a reptile and Digital Lux meter, and would like to learn how to use it for ensuring a comfortable habitat for the reptile.