Groline pH 4.01 Calibration Solution 1100 GPH once per week

once per week

amplified pH electrode with built-in EC/TDS and temperature sensors

By employing naturally occurring plant and biological compounds

ensuring even coverage over your grow area

Groline pH 4.01 Calibration Solution 1100 GPH once per weekhigh 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.