Bluelab Conductivity Pen LED while the XL covers 54

while the XL covers 54

and never cover or obstruct the heater

dry locations only

while the elevated plate keeps the pot itself clear of standing water and the buildup that forms in it

Both end flanges are aluminium

Bluelab Conductivity Pen LED while the XL covers 54The Bluelab Conductivity Pen is a compact and reliable tool for accurately measuring the strength of nutrient solutions in hydroponic systems. It provides instant readings of EC, CF, and PPM across multiple scales, allowing growers to maintain precise nutrient concentrations for optimal plant health and productivity. With a waterproof, floatable design and automatic temperature compensation, the Conductivity Pen is built for daily use in demanding