EC / PPM & TDS Meters

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Showing 1 - 24 of 26 products
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Aquamaster Tools P110 Pro Combo Ph, EC & Temp PenAquamaster Tools P110 Pro Combo Ph, EC & Temp Pen
Aquamaster Tools P110 Pro Combo Ph, EC & Temp Pen
$159.95 $172.95
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AZ Waterproof EC & TDS PenAZ Waterproof EC & TDS Pen
AZ Waterproof EC & TDS Pen
$73.99 $84.44
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Bluelab Conductivity EC Pen
Bluelab Conductivity EC Pen
$144.15 $206.39
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Bluelab Truncheon Commercial Scale Nutrient EC MeterBluelab Truncheon Commercial Scale Nutrient EC Meter
Bluelab Truncheon Commercial Scale Nutrient EC Meter
$200.80 $290.34
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Bluelab Truncheon EC Standard ScaleBluelab Truncheon EC Standard Scale
Bluelab Truncheon EC Standard Scale
$185.35 $262.08
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Aquamaster EC1413 Calibration Solution - 100mlAquamaster EC1413 Calibration Solution - 100ml
Aquamaster EC1413 Calibration Solution - 100ml
$25.70 $29.95
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Bluelab Combo Meter PH + ECBluelab Combo Meter PH + EC
Bluelab Combo Meter PH + EC
$438.73 $560.66
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Aquamaster P160 Pro Combo pH – EC – PPM – TDS – Temp MeterAquamaster P160 Pro Combo pH – EC – PPM – TDS – Temp Meter
Aquamaster P160 Pro Combo pH – EC – PPM – TDS – Temp Meter
$226.55 $244.95
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Bluelab Ph & Conductivity Starter PackBluelab Ph & Conductivity Starter Pack
Bluelab Ph & Conductivity Starter Pack
$349.95 $399.95
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Growth Technology EC Solution 1.413 (EC1413) – For Aquamaster Meters 250mls
Growth Technology EC Solution 1.413 (EC1413) – For Aquamaster Meters 250mls
$19.95 $24.95
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Bluelab Combo Meter Plus Leap Probe PH, EC Temp & Soil PH
Bluelab Combo Meter Plus Leap Probe PH, EC Temp & Soil PH
$545.83 $883.97
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Aquamaster Tools E60 Pro EC/PPM/TDS/Temp MeterAquamaster Tools E60 Pro EC/PPM/TDS/Temp Meter
Aquamaster Tools E60 Pro EC/PPM/TDS/Temp Meter
$118.40 $139.95
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Aquamaster EC1413 Calibration Solution - 20mlAquamaster EC1413 Calibration Solution - 20ml
Aquamaster EC1413 Calibration Solution - 20ml
$10.25 $14.95
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Aquamaster Tools E50 Pro EC Temp meterAquamaster Tools E50 Pro EC Temp meter
Aquamaster Tools E50 Pro EC Temp meter
$118.40 $139.95
Spider Farmer 5-in-1 hydroponic pH meter kit with calibration powders and USB Type-C cableSpider Farmer 5-in-1 pH meter showing high-precision electrode sensor
Spider Farmer 5-in-1 Hydroponic pH Meter Kit - pH/EC/TDS/Temp/Salinity
$90.00
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AC Infinity Hydroponic Meter Pro Kit, ALL-IN-ONE PH PEN, Interchangeable ProbeAC Infinity Hydroponic Meter Pro Kit, ALL-IN-ONE PH PEN, Interchangeable Probe
AC Infinity Hydroponic Meter Pro Kit, ALL-IN-ONE PH PEN, Interchangeable Probe
$279.95 $299.95
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Bluelab One-Pen EC, PH & Temp Combo PenBluelab One-Pen EC, PH & Temp Combo Pen
Bluelab One-Pen EC, PH & Temp Combo Pen
$463.45 $499.95
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HM Digital AP-2 AquaPro Water Quality Tester -EC & TempHM Digital AP-2 AquaPro Water Quality Tester -EC & Temp
HM Digital AP-2 AquaPro Water Quality Tester -EC & Temp
$54.54 $61.95
Bluelab Guardian Monitor Inline With Wifi
Bluelab Guardian Monitor Inline With Wifi
$998.95
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Aquamaster Replaceable PH – EC Electrode For P110 Pro-2
Aquamaster Replaceable PH – EC Electrode For P110 Pro-2
$99.95 $109.95
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Aqua Master UTP Cable - 150cm
Aqua Master UTP Cable - 150cm
$40.00 $60.00
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Aqua Master C800 Pro Inline ControllerAqua Master C800 Pro Inline Controller
Aqua Master C800 Pro Inline Controller
$2,040.00 $3,060.00
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Aqua Master C800 Pro Controller
Aqua Master C800 Pro Controller
$1,528.00 $2,292.00
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Aquamaster Tools P700 PRO-2 Combo Meter pH-EC–CF–PPM–TempAquamaster Tools P700 PRO-2 Combo Meter pH-EC–CF–PPM–Temp
Aquamaster Tools P700 PRO-2 Combo Meter pH-EC–CF–PPM–Temp
$458.30 $499.95

One measurement, three labels

EC, PPM and TDS are the same measurement wearing different units. EC (electrical conductivity, in mS/cm) is what the meter actually reads; PPM and TDS figures are conversions of it — and different meters use different conversion scales, so the same solution can show 1000ppm on one meter and 1400ppm on another. Pick one unit, learn your meter's scale, and stay consistent.

The range

The Truncheon. Bluelab's Truncheon is the grow-room classic — waterproof, dunk-and-read, in standard and commercial scales for heavier commercial feeds.

Pens. Bluelab's Conductivity Pen, AZ Instruments' waterproof EC/TDS pen and the Essentials pen keep it simple; Aquamaster's E50 and E60 add PPM, TDS and temperature to sharp-priced pro housings.

Combos and monitors. Every pH & EC combo meter reads feed strength too, and the Bluelab Guardian watches EC around the clock.

Calibration. EC meters calibrate against a conductivity standard — 2.76/2.77 CF and EC1413 solutions from Bluelab, Aquamaster and Growth Technology are stocked in sizes from 20mL sachets up.

Three EC habits

  1. Measure at the reservoir, same time daily. EC rises as plants drink and falls as they feed — the trend tells you more than any single reading.
  2. Check EC before and after adding nutrients. It's the only way to know what strength you actually mixed.
  3. Calibrate against a standard, monthly at least. Unlike pH probes, EC electrodes store dry — but they still drift.

EC / PPM & TDS Meters FAQ's

Nothing physical — they're the same measurement in different units. The meter reads electrical conductivity (EC); TDS and PPM numbers are calculated from it using a conversion scale, commonly 500 or 700. That's why two meters can honestly disagree on ppm while agreeing on EC. If you swap between meters, compare in EC.

It depends on the crop, stage and feed chart — seedlings and cuttings want a weak solution, heavy flowering wants the strongest. Rather than chasing one magic number, follow your nutrient brand's chart, then use the meter to confirm what you actually mixed and to watch how the reservoir moves between top-ups.

Dip the clean probe in a conductivity standard — 2.76/2.77 CF or 1413 µS solutions are the common references — and set the meter to match. Use fresh solution each time and never pour it back in the bottle. Monthly is plenty for most growers; commercial rooms calibrate more often.

No — that's the easy part. EC electrodes store clean and dry, no KCl required, which is why a Truncheon lasts as long as it does. Just rinse the probe in fresh water after use so nutrient salts don't crust on the electrodes.

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