pH Buffer 7.0 by Flairform — pH Meter Calibration Solution
FF-MTR-PH7-250
- Low stock - 5 items left
Pairs well with
Flairform pH Buffer 7.0 is a calibration solution for pH meters, made to the internationally agreed recipe with NIST-specified ingredients. It's the first point in every proper calibration — the neutral reference that sets your meter's offset before pH Buffer 4.0 confirms the slope. Professional practice calls for both: two buffers at least three pH units apart, so you know the electrode and meter are ranging correctly. Stabilised against algae growth for exceptional shelf life. Available in 250ml and 1L.
Specifications
- Always calibrate 2-point: this pH 7.0 first, then 4.0. Single-point calibration on 7.0 alone can't confirm the slope — some meter brands claim it's enough, professional practice says otherwise.
- Never dip the probe into the bottle. Decant a small amount into a clean cup and discard it after use — dipping contaminates the whole bottle.
- Keep the bottle closed and stored cool and dark. Contaminated or degraded buffer means calibrating to a wrong reference.
How to Use
Pairs Well With
The other half of the 2-point calibration — 7.0 sets the offset, 4.0 confirms the slope.
Flairform pH Electrode StorageAfter calibrating, store the probe in solution — never dry, never in buffer.
pH Control & CalibrationCleaners, standards and pH adjusters — the full accuracy toolkit.
Frequently Asked Questions
Is calibrating with pH Buffer 7.0 alone enough?
No. Some manufacturers claim their meters only need 7.0, but professional practice stipulates two buffers at least three pH units apart. One point sets the offset but can't verify the slope — a meter that reads 7.0 correctly can still be wrong at 5.8, exactly where your nutrient solution sits.
Which buffer do I use first, 7.0 or 4.0?
7.0 first, always. The neutral point sets the meter's offset, then 4.0 sets the slope. Rinse the probe between buffers so you don't carry one into the other.
Can I store my pH probe in this buffer between uses?
No. pH buffers are not suitable for storing pH electrodes — they can upset electrode calibration. Use a dedicated storage solution like Flairform pH Electrode Storage instead.
How often should I calibrate my pH meter?
Follow your meter's manual, and recalibrate any time readings drift or respond slowly. Well-maintained probes stored in proper solution hold calibration far longer than probes stored dry.
Is this buffer hazardous?
No. Per the safety data sheet it is non-hazardous, non-corrosive and a non-dangerous good — a dilute phosphate solution requiring no PPE in normal use. Keep it out of waterways, as it promotes algae growth.
Every Calibration Starts at 7.0
Set the offset, then confirm the slope. Free shipping over $499*.
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