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"Blackout" bags are black on both sides
0 first (buffer) then to pH4
Tests pH at a range of 0 pH-14 pH
Use with Athena Pro Core for a complete and balanced recipe
Bluelab® pH 7.0 Calibration Solution 500ml roots "Blackout" bags are black on"pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7. 0 first (buffer) then to pH 4. 0 (slope). Calibration Solution should be stored in a cool place out of direct sun and heat. They should be stored with the lids securely tightened."
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