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The full range
The solutions for super accurate calibration. Use these at 25 degrees centigrade and never keep an opened bottle for more than 6 months. We only recommend using pH 7 buffer when calibrating our Hobby pH meters since using pH 4 buffer as well can cause confusing readings.
pH 7 BUFFER IS TEMPORARILY OUT OF STOCK - PLEASE DO NOT ORDER.
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*Growell Hydroponics offers these Calibration & Storage Solutions ... |
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Standard
postage
(per order):
£5.95 |
 Surcharge
on heavy items marked with:
£5.00 |
Surcharge for Scottish Islands, Northern Ireland
& Isle of Man:
£20.00 |
Surcharge for Eire:
£25.00 |
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