Groline pH 4.01 Calibration Solution Size:230mL It’s safe for plants and

It’s safe for plants and effective for use in soil & soilless media

By adding an amino acid source of nitrogen

Let’s take a look at this proven method for immediately improving the quality and market price of your harvests…

kelp extract

Groline pH 4.01 Calibration Solution Size:230mL It’s safe for plants andhigh quality pH 4. 01 calibration buffer that is NIST traceable and supplied with a Certificate of Analysis. Hanna calibration buffers have the lot number and expiration date clearly marked on the label and are air tight with a tamper proof seal to ensure the quality of the solution. Hanna's line of technical calibration buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.