Bluelab OnePen™ 3-in-1 pH, EC & Temperature Pen – Bluetooth, IP68 & Edenic App for Hydroponics mountain spring water effect A double junction electrode has

A double junction electrode has an internal compartment surrounding the reference wire

Essential for calibrating TDS/EC meters in hydroponics (nutrient solution monitoring)

Santevia Mineral Stones complete the process: as the final (7th) stage of the Gravity Water System

Parameters: pH

It's designed as a direct replacement for existing sediment filters in whole house applications

Bluelab OnePen™ 3-in-1 pH, EC & Temperature Pen – Bluetooth, IP68 & Edenic App for Hydroponics mountain spring water effect A double junction electrode hasBluelab OnePen 3 in 1 pH, EC & Temperature Pen with Bluetooth & Edenic App The all in one precision measurement tool for serious growers. The Bluelab OnePen simultaneously measures pH, electrical conductivity (EC), and temperature giving you the complete picture of your nutrient solution in a single dip. Connect via Bluetooth to the Edenic app for real time data, remote monitoring, and comprehensive grow management from your phone or browser. With a