HM Digital Hydromaster - Continuous pH/TDS/EC/Temp meter

Continuous In-Line pH/TDS/EC/Temp Monitor for Reservoirs

Spot-checking a reservoir with a handheld meter only tells you the reading at that exact moment, not what happened between checks. The HM Digital Hydromaster is a continuous pH/TDS/EC/Temp meter built to stay in place and monitor a reservoir around the clock.

Sold as one HM Digital Hydromaster continuous monitor.

Key Features & Benefits

• Continuous, not spot-check, monitoring — stays connected to track pH, TDS, EC, salinity, and temperature over time.
• Displays 3 parameters simultaneously — with data-hold capability for up to six stored values.
• ATC using three temperature coefficients — keeps EC/TDS readings accurate as reservoir temperature shifts.
• Replaceable sensors — extends the monitor's working life without replacing the whole unit.
• 24in shielded coaxial sensor cable — reaches into a reservoir while the display stays accessible.

Who Should Use the HM Digital Hydromaster HM-100

This fits growers running reservoir-fed hydroponic systems who want continuous pH/TDS/EC/temperature tracking instead of relying on periodic handheld spot checks.

About the HM Digital Hydromaster HM-100

The Hydromaster HM-100 is a continuous reservoir monitor for pH, TDS, EC, and temperature, with replaceable sensors and ATC.

Frequently Asked Questions

How is the Hydromaster different from a handheld meter?

It's built for continuous monitoring rather than spot checks, staying connected to a reservoir to track pH, EC, TDS, salinity, and temperature over time. A handheld meter only gives you a reading at the moment you test.

What parameters can I see at once?

It displays 3 parameters simultaneously (pH/EC or TDS/Temp) and holds up to six stored values. That lets you review recent readings without needing to log them manually.

How does the Hydromaster stay accurate as temperature changes?

It uses Automatic Temperature Compensation (ATC) across three temperature coefficients. That compensation keeps EC and TDS readings accurate even as reservoir temperature shifts throughout the day.

Can the sensors be replaced?

Yes, the Hydromaster uses replaceable sensors connected by a 24in shielded coaxial cable. That means you can restore accuracy over time without replacing the entire monitoring unit.