Bluelab PPM Conductivity Pen Containers + Support It requires no tools for

It requires no tools for assembly

The plug may form whiteness on them due to

and yields

Easy to install and compatible with peel and stick zippers for creating sealed doorways

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

Bluelab PPM Conductivity Pen Containers + Support It requires no tools forBluelab 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