AZ Waterproof EC & TDS meter Pen

What does the AZ Waterproof EC & TDS Meter Pen measure?

It measures EC (electrical conductivity), TDS (usually shown as ppm), and temperature. You can switch between EC and TDS depending on your preference, and it includes auto-ranging and a customizable TDS conversion factor.

What’s the measuring range of the AZ Waterproof EC & TDS Meter Pen?

It typically reads up to 9999 ppm and temperatures from -5°C to 60°C. Automatic temperature compensation (ATC) ensures accurate readings even if the water temperature fluctuates.

Is the AZ Waterproof EC & TDS Meter Pen waterproof?

It features IP65 water resistance, meaning it's safe against splashes and dust—perfect for grow rooms and mixing areas. However, it's not meant for full submersion unless your model explicitly says so.

What types of grows or systems can I use it for?

It’s ideal for hydroponics, coco, soil runoff testing, aquariums, ponds, and basic drinking water checks. Just remember—it doesn’t identify contaminants, only conductivity levels.

How do I calibrate the AZ Waterproof EC & TDS Meter Pen?

Calibrate monthly using a standard EC solution like 1413 µS/cm. Most models support multi-point calibration and should be calibrated in EC mode. A quick pre-soak helps if the probe has been dry.

What batteries does the meter use?

Most models run on four LR44 button cell batteries. It also features auto power-off and a low battery indicator—important since low power can cause inaccurate readings.

Why am I getting different readings in the same reservoir?

It’s usually due to poor mixing, temperature layers, bubbles on the sensor, or testing too close to a nutrient or air input. For consistent results, measure in a well-mixed, stable area.

How should I clean and store the EC & TDS Pen?

Rinse after each use and store it dry with the cap on. Avoid measuring concentrates, scraping the sensor, or letting salt crust over. No special storage solution is needed for EC/TDS probes.

Why is my meter reading too high or too low?

High readings usually mean salt buildup or calibration drift. Low readings may indicate old batteries, a dirty sensor, or diluted testing zones. Always check probe condition and calibration first.

Can the AZ Waterproof EC & TDS Meter Pen help manage nutrients?

Yes—by helping you avoid overfeeding (nutrient burn) or underfeeding (deficiencies). It also shows how EC can rise due to evaporation or drop from dilution or plant uptake.

Does the AZ Waterproof EC & TDS Meter Pen have a hold feature?

Yes—it includes a HOLD button that freezes the current reading, which is helpful when testing in hard-to-see or awkward areas.

What’s the best way to measure with this meter?

Use a clean, well-mixed sample. Avoid bubbles, measure away from dosing or air stones, and rinse after each test. A sample cup is often cleaner if you're testing multiple systems.

Do TDS readings from this meter match other brands?

Not always. Different brands use different TDS conversion factors. For consistency, rely on EC when comparing readings across different meters or nutrient charts.

How does auto temperature compensation help?

ATC adjusts readings automatically as water temperature changes. This avoids inflated EC numbers in warm tanks or misleading low readings in cold solutions.

What’s the simplest best-practice routine?

Calibrate monthly, rinse after every use, avoid bubbles, don’t measure concentrates, replace batteries as needed, and store the pen clean and capped. Consistency is key to accurate readings.