HM Digital makes handheld and continuous-monitoring meters for pH, TDS, EC, and temperature – from simple handheld TDS testers up through the COM-300 Pro Series combo meter and the HM-500 continuous monitor for growers who want to track reservoir chemistry in real time rather than spot-check it.
Shop HM Digital at Hydrobuilder
- HM Digital HM-200 pH/EC/TDS/Temp Monitor
- HM Digital COM-300 Pro Series pH/TDS/EC/Temp Meter
- HM Digital Replacement pH/Temp sensor for PH-200
- HM Digital TDS-3 Handheld TDS/EC/Temp Meter
- HM Digital HM-500 Continuous pH/EC/TDS/Temp Monitor
- Shop All Meters & Testing Supplies
Why Buy HM Digital from Hydrobuilder
Hydrobuilder stocks HM Digital's full meter lineup along with replacement sensors like the pH/Temp sensor for the PH-200, so a worn probe doesn't mean replacing the whole meter. Our team can help you pick the right meter for your setup – call 888-815-9763.
What's the difference between HM Digital's handheld and continuous meters?
Handheld meters like the TDS-3 give spot readings; continuous monitors like the HM-500 track pH, EC, TDS, and temperature in real time in the reservoir.
Does HM Digital sell replacement sensors?
Yes – a replacement pH/Temp sensor is available for the PH-200 monitor rather than requiring a full unit replacement.
Which HM Digital meter should I get for a small hydroponic setup?
It depends on whether you want spot-checks or continuous monitoring – call 888-815-9763 and our team can match a meter to your system.
