General Hydroponics: PPM Calibration Solution Size:1 Quart The Bluelab pH Pen also

The Bluelab pH Pen also measures the temperature of the solution

- cleanable sediment prefilter

Simply plug it in and you’re ready to grow

Setting a new standard across the board is GP3

The multiple sugar varieties help with feeding beneficial bacteria and fungi in your root zone

General Hydroponics: PPM Calibration Solution Size:1 Quart The Bluelab pH Pen alsoGeneral hydroponics uses the highest quality electronic meter reference solutions. Growers can use our reference solutions widely among many popular brands of meters using the NaCl scale. General hydroponics technicians check each batch to ensure that our solutions are exactly calibrated each time they are used.