Groline pH 4.01 Calibration Solution Size:230mL By adding an amino acid

By adding an amino acid source of nitrogen

Use with any garden soil

hand mix tanks

Providing increased nutritional value for blooming

working synergistically to promote overall plant health

Groline pH 4.01 Calibration Solution Size:230mL By adding an amino acidhigh 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.