Bluelab One Pen Beneficial Inoculants giving you everything needed to

giving you everything needed to get through a full growing cycle in an area of one square metre or smaller

since this doesn't carry pH Perfect buffering

better for delicate material

Versus an active pump-fed system like Wilma at the same pot count

Bluelab One Pen Beneficial Inoculants giving you everything needed toBluelab One Pen All in One pH, EC and Temperature Handheld Best for: growers who want Combo Meter style all in one readings but in a single streamlined pen rather than a probe on a cable design. Our thoughts Think of this as Bluelab's take on the combo meter in a tidier, single pen body. It measures pH, conductivity and temperature from one sensor tip, so you get the same "one dip, all the numbers" convenience without a separate cable and display unit