Hobby EC Pen Size:Grow Gadgets EC Pen soil and hydro: 1-2ml per

soil and hydro: 1-2ml per litre of nutrient solution

System compatibility: recirculating hydroponics (DWC

pH and water level regularly

Stop fungus gnat larvae before they eat young roots

Feeds soil biology

Hobby EC Pen Size:Grow Gadgets EC Pen soil and hydro: 1-2ml perKnow exactly how strong your feed is before it hits the roots The Grow Gadgets Hobby EC Pen is a straightforward handheld meter that reads the electrical conductivity (EC) of your nutrient reservoir, giving you a fast, honest check on how concentrated your feed actually is. It's the entry level way to stop feeding by eye, dropping the probe into the tank or run off and reading the strength in seconds so you can catch a mix that's crept too hot or too