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Description: High quality & durable compact pH Tester Pen and TDS Meter are the perfect multi-function devices that can quickly and accurately measure TDS and PH levels in aquariums, swimming pools, drinking water etc. TDS Meter Features: -Saves measurements for convenient reading and recording- Easy to use design makes testing TDS levels easier than ever. - Hold function allows you to hold reading while in the water for view outside of the water.-Turns off meter after 10 minutes of non-use to conserve batteries-Measures form 0-999ppm, with a resolution of 1ppm. From 1,000 to 9,990ppm, the resolution is 10ppm, indicated by drinking x 10image, Factory calibratedSpecifications :1.Color : As picture shows2.Accuracy : +/-2%3.Weight : 68g4..Rang :0-9990ppm5.Item size :155mm x 28mm x 15mm6.Battery : 2 x 1.5V Button Cell battery (included)PH Meter Features: - Multifunctional and great for testing PH levels of swimming pools, aquariums, spas, drinking water, and more!- Easy to use design - Eco-Friendly, reusable device saves you money, and is environmentally friendly.- Backlit LCD screen makes reading results possible in daylight or darkness.Specifications :Color: As picture shows-Measuring pH Range: 0.0- 14.0pH-Resolution: 0.1 pH -Accuracy: ±0.1 pH(20°C), ±0.2pH -Operating Temperature: 0-50°C (32-122°F) -Calibration: Manual,1 point -Item Net Weight: Approx. 57g (after installed batteries) -Item size : 152 x 29 x 20mm (5.984 x 1.142 x 0.591 inch) - Battery: 2x 1.5V Button Cell Batteries (included) NOTE: 100% quality assurance. If you have any question, please contact us,we'll reply to you in 24 hours!