HM Digital Professional Series EC/TDS/Temp Meter (Long) - 7.28 x 1.34 x 1.34-in - IP-67 Waterproof - 0-9990 µS

Check Nutrient Strength and Temperature in One Reading - 7.28 in Handheld

Guessing at nutrient solution strength leads to uneven feeding, and carrying separate tools for conductivity and temperature slows every reservoir check. This meter measures electrical conductivity (EC), total dissolved solids (TDS) and temperature together. It has a waterproof, floating housing, detachable platinum electrodes and push-button calibration to any point within its range. Accuracy is +/- 2%.

This long-format unit is sold each and fits a regular indoor grower who checks reservoirs often, as well as a hobbyist who wants a dependable first meter. Commercial teams can keep one at each station for quick spot checks of hydroponic systems.

Key Features & Benefits

• EC, TDS and temperature in one meter — you read all three without switching tools.
• IP-67 waterproof housing that floats — you can submerge it in a reservoir and retrieve it easily if it slips.
• Push-button digital calibration — you can calibrate to any point within range, and the meter ships factory calibrated with 1413 µS solution.
• Detachable platinum electrodes with replaceable sensor model SP-C1 — you can replace the sensor instead of the whole meter.
• Two AAA batteries included — you can start testing as soon as it arrives.

Who Should Use HM Digital Professional Series EC/TDS/Temp Meter (Long)

Growers running hydroponic systems, mixing nutrient solutions or checking water quality will find it useful. It also suits home gardeners and commercial cultivation teams that want a single handheld for routine checks.

About HM Digital Professional Series EC/TDS/Temp Meter (Long)

HM Digital lists this model as the COM-100L. It measures 7.28 x 1.34 x 1.34 in. EC range is 0 – 9990 µS or 0 – 9.99 mS. TDS range is 0 – 5000 ppm on the 0.5 scale and 0 – 8560 ppm on the 0.7 scale. Temperature range is 0-55 °C (32-130 °F).

Frequently Asked Questions

Q: What does this meter measure?
A: It measures electrical conductivity, total dissolved solids and temperature. You read them from one handheld device.

Q: Can I submerge it?
A: Yes. The housing has an IP-67 waterproof rating, is submersible and floats.

Q: Does it need calibration before first use?
A: It ships factory calibrated with 1413 µS solution. You can recalibrate with the push button to any point within its range.

Q: What is TDS?
A: TDS means total dissolved solids, the amount of dissolved material in water. The meter shows it in ppm or ppt on two selectable scales.

Q: Can I replace the sensor?
A: Yes. The electrodes are detachable, and the replacement sensor is model SP-C1.

Q: What batteries does it use?
A: It uses two AAA batteries, and they are included.