HM Digital Replacement EC/TDS Probe for Hydromaster

Direct-Fit Replacement Probe for the HydroMaster HM-500

A worn or damaged EC/TDS probe can throw off every nutrient reading a meter gives, and replacing the whole unit over one failed part is an unnecessary expense. This probe is built specifically for the HM Digital HydroMaster HM-500, matching the meter's original sensing specification.

It installs as a direct swap-in for the original probe, so you're back to accurate EC/TDS readings without buying a new meter.

Key Features & Benefits

• Direct-fit design — built specifically for the HydroMaster HM-500, no adapters or modifications needed.
• Matches original sensing spec — EC/TDS measurement performance matches the meter's factory-installed probe.
• Simple swap-in install — replaces just the worn component instead of the whole meter.
• Genuine HM Digital part — built to the same specification as the HydroMaster HM-500's original equipment.

Who Should Use This Probe

HydroMaster HM-500 owners whose original probe has worn out, become damaged, or stopped delivering accurate EC/TDS readings.

About HM Digital

HM Digital supports its HydroMaster meter line with direct-fit replacement parts like this probe, letting owners restore accuracy without replacing the entire instrument.

Frequently Asked Questions

What meter is this probe built for?

It's a direct-fit replacement for the HM Digital HydroMaster HM-500 meter specifically. It is not a universal probe for other meter models.

How do I know I need a replacement probe?

Watch for readings that drift, stick, or stop responding even after cleaning and calibration. That's the usual sign a probe has worn out rather than the meter's electronics failing.

Does this replace the whole meter?

No, it replaces only the probe component that connects to your existing HydroMaster HM-500. The rest of your meter's electronics and display stay exactly as they are.

Is this an official HM Digital part?

Yes, it's built by HM Digital to the HydroMaster HM-500's original sensing specification. That means it performs the same as the probe your meter originally shipped with.