Features: Made-with high-quality ABS-material, our digital-water tester features an easy-to-read LCD-display, automatic temperature compensation, and a compact design that fits comfortably in your hand. Ideal-for aquarists, hydroponic-growers, pool-owners, and anyone who-needs to monitor-water quality, our nutrient testing pen is easy to use and provides accurate-results every-time. Whether you're checking the purity of fresh-water or ensuring the efficiency of your RO-system, our TDS-meter is the perfect tool for the job. It is also great for monitoring the water quality in aquariums, swimming pools, and saltwater tanks. With our TDS-Meter Digital-Water Tester, you can take the guesswork out of water quality testing and ensure that your-water is safe and healthy for all your aquatic-pets and-plants. Pocket size, light and portable, backlight-switchable, large LCD-screen, clear reading. Specifications: Material:ABS Size:Approx.18.7x3.7x3.7cm/7.36x1.45x1.45inch Model:EZ-9908 Measuring range: 0-14pH. Measurement accuracy: 0.05 ph. Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Water Quality Tester 1x User Guide