TDS + EC Meter – Conductivity Meter and TDS Pen

This compact pen-style meter is intended for aquarists and terrarists who need to check how much dissolved matter is in their water, for example when preparing tap or RO water for tanks or misting setups. It gives a fast reading of contamination levels in the water sample, so the keeper can decide whether the water needs treatment before use.

Why it matters

• Measures both TDS (ppm / mg per litre) and EC (µS/cm), so the total dissolved content can be checked in two units.
• Resolution of 1 ppm for TDS and 1 µS/cm for EC, with a stated tolerance of ±2%.
• Built-in temperature sensor with a range of 0–80 °C (32–176 °F), useful for reading the sample at its actual temperature.
• Reading hold function lets the keeper freeze the value on the display after taking the sample out of the water.

Specifications

• Measurement range TDS: 0–99990 ppm (mg/l)
• Measurement range EC: 0–99990 µS/cm
• Temperature measurement: 0–80 °C / 32–176 °F
• TDS accuracy: 1 ppm
• EC accuracy: 1 µS/cm
• Measurement tolerance: ±2%
• Power supply: 3 V
• Net weight: 55 g
• Dimensions: 15.4 cm x 3 cm x 1.4 cm
• Included: TDS/EC meter, protective case, instruction manual

What it works with

The meter is a water testing tool, so it fits any setup where the keeper prepares or monitors water, including freshwater and marine aquariums and reptile enclosures that use water for humidity or drinking. Because it measures general dissolved content rather than specific substances, it is best used as a routine check of water consistency alongside other test methods.