Aqua Master Tools S300 Pro2 pH Substrate Replacement Electrode
Aqua Master Tools S300 Pro2 pH Substrate Replacement Electrode
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Order by 3pm Mon–Fri — we aim to post same day · FREE Express Delivery over £60 · 1–2 working days · Free Wembley pickup
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A genuine spare probe for the S300 Pro2 substrate pH meter
The S300 Pro2 is a direct-insertion meter growers use to check pH straight in coco, rockwool or soil rather than relying on a squeezed runoff sample, and like the rest of the Aqua Master Tools range its electrode is designed to be replaced on its own once it wears from repeated insertion into substrate. This is the factory-spec BNC-connector pH probe built to the original S300 Pro2 specification.
Substrate pH probes take more physical punishment than a probe that only ever sits in liquid, since they are pushed in and out of solid growing media on every use, so they naturally wear faster and are worth keeping a spare of if the meter is used regularly. It is IP67 waterproof and fits the same connector as the original electrode, giving a straightforward swap with no other changes needed to keep the S300 Pro2 running accurately.
- Genuine replacement electrode built to original S300 Pro2 specification
- BNC connector for direct-fit swap onto the meter
- IP67 waterproof for repeated insertion into wet substrate
- Built for the physical wear of direct substrate insertion
- Restores accuracy once the original probe wears down
- Compatible with: Aqua Master Tools S300 Pro2 Substrate pH/Temp meter
- Connector: BNC
- Waterproof rating: IP67
- Measures: pH (substrate, direct insertion)

FREE Express Delivery on orders over £60. We aim to post same day for next-working-day arrival — order by 3pm Mon–Fri. Delivery is 1–2 working days. A few harder-to-stock or large, bulky items can take a little longer — we'll tell you if that applies to your order. Heavy-item surcharges are always shown at checkout before you pay — we only ever charge what delivery costs us. Prefer to collect? Free pickup at our Wembley store.