Bluelab PPM Conductivity Pen Oscillating The slim runs the length

The slim runs the length of the tube instead

and odor from a tent or to move air into a room

Without it

Nitrogen (N): 7

and other pollutants that may decrease the quality and value of your end product

Bluelab PPM Conductivity Pen Oscillating The slim runs the lengthBluelab PPM (Parts Per Million) Pen Testing Meter for Hydroponics and Solution Measuring Bluelab PPM Pen is the latest innovation for hand held conductivity meters and the ultimate handy solution for measuring conductivity. Hydroponic growing lets you give the best care possible to your plants. The quality of care is in your control. The Bluelab ppm Pen provides a compact, quick and handy way to manage the success of your crops to ensure they have the