Bluelab OnePen Replacement Probe Knockbox it is robust as well

it is robust as well as easy to maintain

UHMW Polyethylene SaddleTwister

divided into two zones

It is perfect for use as a part of a hydroponic nutrient solution because it is inexpensive

This is the original reservoir barrel used in our Flo-n-Gro gardens

Bluelab OnePen Replacement Probe Knockbox it is robust as wellA replacement pH, Conductivity (EC), and Temperature Probe for Bluelab OnePen (PENONE) Maximise the life & accuracy of your Bluelab OnePen Features: Extends the life of your Bluelab OnePen minimising the need for full device replacements Quick and simple to replace, reducing downtime and keeping your OnePen functioning optimally Built to last with a double junction pH probe and titanium EC electrodes Delivers precise pH, Conductivity (EC), and