GroLine pH 4.01 Calibration Buffer (500 mL) extension or they can be used

or they can be used for flowering by stacking the 4x4x3 on top of this 6x6x4

soil and soil-less mediums

Designed for and formulated for hydroponics

• Assists with increased flower production

You can also increase the capacity with one or many load switcher box iLS4-121

GroLine pH 4.01 Calibration Buffer (500 mL) extension or they can be usedHI7004 050 is a high 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