Swap the Worn Probe and Keep the Meter with Aqua Master Replacement Probes
Genuine Aqua Master replacement probes plug straight into the H600 Pro, H600 Pro Substrate and C800 Pro, along with other Aqua Master meters. Choose a pH probe or pH substrate probe on a BNC connector (a twist-lock plug), or an EC probe or EC substrate probe on a small pin connector.
Why You Need It
pH probes age. Over time the reference liquid inside gets contaminated, response slows, and eventually the probe stops calibrating. EC probes are tougher but can still fail from limescale, leaks or a cable that's hardened with age. Either way, the meter's fine. Swap the probe, recalibrate, carry on.
Which Probe Fits Your Meter?
| pH probe, BNC (AMT1021.2) | H600 Pro, H600 Pro Substrate, C800 Pro, P700 Pro2, S300 Pro2 |
|---|---|
| pH substrate probe, BNC (AMT1031) | H600 Pro, H600 Pro Substrate, P700 Pro2, S300 Pro2 |
| EC probe, small pin (AMT1023) | H600 Pro, H600 Pro Substrate, C800 Pro, E300 Pro |
| EC substrate probe, small pin (AMT1036) | H600 Pro, H600 Pro Substrate, E300 Pro |
The W650 Pro Inline uses its own threaded inline probes. For the P700 Pro2's EC electrode, see the P700 Pro2 Replacement EC Electrode.
Liquid or Substrate?
- Standard pH probe: a long double junction design (two reference chambers instead of one), which gives it a longer working life in liquids.
- pH substrate probe: a glass tip in a tough plastic body, made for pushing into soft, moist media like coco, compost and grow bags.
- EC substrate probe: stainless steel and almost unbreakable, built for daily use in media.
How To Fit an Aqua Master Probe
- Unplug the old probe: twist off the BNC plug or pull the pin connector.
- Plug in the new one: it only goes one way.
- Soak pH probes: stand them in tap water for at least 12 hours before first use.
- Calibrate: calibrate the meter before taking readings.
Top tip: Keep pH probes wet with a few drops of KCl storage solution in the cap. Dry glass is slow glass.
FAQs
There's white crust on my new pH probe. Is it faulty?
No. Dried salts are normal and the 12-hour soak dissolves them.
Can I add substrate probes to a standard H600 Pro?
Yes. Both H600 Pro meters take liquid and substrate probes, so one meter can cover your reservoir and your media.
Need help choosing? Call our growing experts on 01782 749955 or visit One Stop Grow Shop Stoke at Fenton Trade Park.
Got the probes, need the meter? Browse our full range of pH and EC meters.
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