Red and white pH meter with digital display, packaging, and water droplets on a white background with text 'US Seller Fast Shipping From USA'.

TDS meter being held over a glass of water with a color-coded chart on the left.

Digital conductivity meter with water quality graphics and text on a white background

Digital pH meter with labeled parts and dimensions on a white background

Comparison of water quality pens with automatic and manual calibration methods.

Calibration instructions for an EC and TDS measurement device on a white background.

pH calibration process diagram with digital display and text instructions on a white background

Diagram of a digital instrument's operation with temperature and mode buttons on a white background.

Person drinking water, water quality testing device, and various water-related activities.

Digital pH meter with user instructions and contact information on a white background

Measurement device with high precision electrode, large capacity button battery, and HD LCD display on a white background.

Images of water quality testing scenarios including drinking water, fishery, laboratory, aquarium, swimming pool, and fish tank.

Red and white water quality tester with digital display in a glass of water on a white background

4-in-1 Digital Water Tester – pH, EC, TDS & Temperature

4-in-1 Digital Water Tester – pH, EC, TDS & Temperature

$19.95

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Four water readings in one pocket tester

Check pH, electrical conductivity (EC), total dissolved solids (TDS), and temperature with this compact digital water-testing pen. For hydroponic setups, aquarium maintenance, or basic field screening, it brings four useful readings together on an LCD display so you can record and compare sample conditions.

Supplier-listed features

pH measurement range: 0–14, with 0.01 pH display resolution.
TDS measurement range: 0–9,990 ppm.
Temperature compensation range: 32–140°F, with selectable Fahrenheit display.
Three-point pH calibration using pH 4.00, 6.86, and 9.18 buffers.
Backlit LCD, reading-hold function, and automatic power-off.
Red ABS housing.

Use and measurement limits

Calibrate and care for the probe according to the supplied instructions. Prepare calibration solutions using the buffer manufacturer's specified dilution, rather than a generic recipe. Let readings stabilize before recording them, and follow the manual's rinsing and storage guidance.

The stated 0.01 pH resolution describes the display increment, not verified measurement accuracy. EC range, accuracy tolerances, battery requirements, and calibration-buffer inclusion have not been confirmed. Temperature compensation does not mean readings are unaffected by all temperature changes.

This tester measures selected water properties; it does not establish drinking-water safety or identify bacteria, lead, pesticides, or every contaminant. It is not a substitute for laboratory testing or a complete pool, spa, or aquarium test kit. The supplier lists IP67 resistance, but documentation has not been verified; do not assume the entire tester can be submerged.