Bluelab PPM Conductivity Pen Containers + Support The wrapper is what separates

The wrapper is what separates a 300-count case from loose bulk

The plug may form whiteness on them due to

you're not just improving their health

and yields

Bluelab PPM Conductivity Pen Containers + Support The wrapper is what separatesBluelab 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