High Accuracy TDS Meter Digital Water Tester Digital 0-14 PH Meter Tester 0-9990ppm TDS&EC LCD Water Purity PPM Aquarium Filter Note: Dear customer,thanks for your support,please note that PH meter need LR44 battery and TDS&EC meter need CR2032 battery,because if the product with battery, the customs will not pass, so the product does not include the battery, and product come without retail box, hope you understand, thanks a lot. Product Highlights: Application: Great for all home and laboratory TDS & pH testing applications including aquariums, swimming pools PH Meter: Full measurement range of pH 0 - 14, reliable and quick readings 3-in-1 TDS Meter: Measurement Range 0-9990ppm, 0-9990s/cm; Accuracy 2%, 0.1- 80.0C, 32.0-176.0F. Note: This meter can't test sea water. Features: Comes with protective case; Lightweight, handheld design for portability and convenience EASY CALIBRATION: This PH pen is featured with auto temperature compensation which can be adjusted to water temperatures and water quality to give PH readings almost instantly. As well, the tester can be tested with using Buffer Powder.