TDS Pen Meter

This pocket-sized TDS meter is intended for keepers who need to check how many dissolved substances are in their water before filling or topping up a tank. Its small body makes it easy to take readings directly from a container or aquarium.

Why it matters

• Measures total dissolved solids, which indicates the level of contaminants in the water.
• Covers a range of 0 to 9990 ppm (mg/l) with a resolution of 1 ppm and a tolerance of ±2%.
• Built-in temperature sensor, with a measuring range of 0 to 80 °C, reported alongside the TDS reading.
• Reading hold function locks the displayed value so it can be read after the probe is removed from the water.

Specifications

• TDS measuring range: 0 – 9990 ppm (mg/l)
• Temperature measuring range: 0 – 80 °C
• Accuracy: 1 ppm
• Tolerance: ±2%
• Calibration: NaCl solution, 342 ppm
• Power supply: 2 x 1.5 V
• Net weight: 76.5 g
• Dimensions: 15.5 cm x 3.1 cm x 2.3 cm

What it works with

The meter is suited to water testing in freshwater and saltwater aquarium and terrarium setups, where dissolved solids are checked before water changes or when preparing new water. Because it is compact and works with a single pen-style body, it fits easily into a routine check of several tanks. The package includes the meter, a protective pouch and the instruction manual.