General Hydroponics: PPM Calibration Solution Size:1 Quart And many others give out

And many others give out different levels of quality

The Bluelab pH Pen also measures the temperature of the solution

but other companies may claim to have “organic” products

- cleanable sediment prefilter

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

General Hydroponics: PPM Calibration Solution Size:1 Quart And many others give outGeneral 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.