HM Digital Replacement TDS/EC Sensor for HM-500 Meter

Restore Reliable Nutrient Readings - HM-500 Replacement Probe

A worn probe makes nutrient readings drift, and bad readings lead to feeding mistakes in hydroponic systems. This HM Digital replacement sensor gives your HM-500 meter a fresh probe that measures conductivity (EC), total dissolved solids (TDS) and temperature, so you can keep monitoring your solution with confidence.

Sold as a single unit, it suits home growers and commercial operations alike who want to keep an existing HM-500 in service instead of replacing the whole meter.

Key Features & Benefits

• EC and TDS measurement — track nutrient strength in whichever scale you prefer.
• Temperature measurement — read solution temperature alongside nutrient strength.
• Heat-resistant ABS probe — built for durable day-to-day use.
• 78.7 in (2 m) cable — reach reservoirs without holding the meter over the water.
• Made for the HM-500 — minimal setup when you swap it in.

Who Should Use HM Digital Replacement TDS/EC Sensor

Anyone who owns an HM-500 meter and sees unstable, drifting or unreliable readings. It fits growers running hydroponic systems who check nutrient solution regularly during vegetative growth and flowering.

About HM Digital Replacement TDS/EC Sensor

HM Digital makes meters and controllers for water and nutrient monitoring. This replacement sensor is designed for the HM-500 meter and measures EC, TDS and temperature. It is manufactured in Korea.

Frequently Asked Questions

Q: Which meter does this sensor fit?
A: It is designed for the HM Digital HM-500 meter. Do not assume it fits other models.

Q: When should I replace my probe?
A: Replace it when performance declines or readings become unreliable. Drifting or erratic values after proper calibration are common signs.

Q: What is the difference between EC and TDS?
A: EC measures how well the solution conducts electricity, which reflects dissolved nutrient salts. TDS is an estimate of total dissolved solids derived from that conductivity.

Q: Does it measure temperature too?
A: Yes. It includes a temperature sensor so you can read solution temperature along with nutrient strength.

Q: How long is the cable?
A: The cable is 78.7 in (2 m), enough to reach into most reservoirs comfortably.

Q: Is it difficult to install?
A: No. It is designed to connect to the HM-500 with minimal setup. Recalibrate the meter afterward as the manual directs.