Bluelab pH Penplus - Replaceable pH probe Fungicides If you prefer a solid

If you prefer a solid colour instead of colour changing

Max pond size without fish shaded (L): 4000

4 Gallons | Thickness Rating: 500G | Quantity: 5-Pack | BPA-Free

Flush once a month with plain water to remove traces of mineral salts build up

Bluelab pH Penplus - Replaceable pH probe Fungicides If you prefer a solidThe difference is simple. When natural probe wear occurs, the probe can be replaced, not the whole pen. Simply swap out the probe to quickly restore performance. Built to IP68 standards, dustproof, waterproof, and designed for demanding environments, the pH PenPlus encourages long term use while protecting your workflow and investment. The pH PenPlus is about readiness. Keeping a replacement probe on hand means less downtime, less disruption and