7 in 1 Water Quality Tester Pen Digital LCD pH TDS EC Salinity ORP

Checking the quality of your water has never been simpler. This 7 in 1 water quality tester pen brings seven essential measurements into one compact, handheld device with a large digital LCD screen. Whether you are testing drinking water, a swimming pool, or a pond, this pen lets you read pH, TDS, EC, salinity, ORP, temperature, and specific gravity at a glance, making it a practical companion for everyday water monitoring.

• Seven measurements in one device: pH, TDS, EC, salinity, ORP, temperature, and S.G (specific gravity) for seawater, covering a wide range of water testing needs.
• Large digital LCD display with backlight, so readings are easy to view in different lighting conditions.
• Switch freely between degrees Celsius and Fahrenheit for temperature readings.
• Automatic shutdown helps conserve battery life between uses.
• Compact, lightweight pen design (185 x 37 x 24 mm) that is easy to carry and handle.
• IP67 waterproof rating (P67 grade) for reliable use around water.

Understanding water quality starts with knowing what is in it. The pH measurement ranges from 0.01 to 14.00, allowing you to determine whether water is acidic, neutral, or alkaline. Alongside pH, the TDS (total dissolved solids) function reads from 0 to 200000 ppm, with a finer 10.1 to 200.0 ppm range, giving a sense of the dissolved minerals and substances present. The EC (electrical conductivity) function, measuring from 0 to 200000 µS/cm, reflects how well water conducts electricity, which is closely related to its dissolved content.

For those interested in water with higher mineral content, the salinity function measures from 0.01 to 20.00 percent. The product information notes that a suitable salinity value for human intake is around 0.900 percent, which can be useful for anyone comparing readings against that reference. The ORP (oxidation-reduction potential) function, measuring up to +1999 mV, is an important indicator of water quality and can reflect the ecological condition of aquatic systems, making the pen relevant for pond and aquarium owners who want to keep an eye on their environment.

The temperature function covers 0.1 to 60.0°C (32.0 to 140°F), and you can freely switch between Celsius and Fahrenheit depending on your preference. The specific gravity (S.G) function measures seawater from 1.000 to 1.222. Seawater density in different regions is typically around 1.02 to 1.07, so this reading can help you assess the salt content of saltwater environments, including those used for swimming or marine hobbies.

This water tester pen suits a wide variety of applications. Households can use it to check drinking water, while swimming pool owners can monitor water conditions before and after use. Pond keepers, aquarium hobbyists, and anyone maintaining natural water features will find the ORP and temperature readings especially useful. Because all seven measurements are built into one device, you do not need to carry multiple testers to get a broader picture of your water.

The pen is powered by three LR44 batteries, which are included with the product, so it is ready to use straight out of the box. The large screen and backlight make reading results comfortable, while the compact body keeps the tester easy to store in a drawer, bag, or equipment kit. Its IP67-level waterproof grade means it can be dipped into water for testing without concern for everyday splashes.

If you are searching for a digital water quality tester that combines several measurements in one affordable, portable pen, this 7 in 1 model offers a convenient way to monitor water conditions at home, at the pool, or around your garden pond. Keep it handy, follow the measurement ranges to understand your results, and enjoy a simpler approach to everyday water testing.