Features of blue: This is a digital TDS meter tester, used to test the purity of the filter water quality, check the performance of the water filter, and check the hardness (1 particle = 17ppm) to ensure that you always drink pure water. Automatic shutdown function: Turn off the meter after 5 minutes of non-use to save battery. Automatic temperature compensation Conversion between TDS and conductivity Can be used for: water purifiers and filters, food (vegetables, fruits) and beverage quality monitoring, swimming pools and spas, aquariums, hydroponics specification: Measuring range: EC: 0-9990Ous / cm; TDS: 0-9990ppm; Celsius temperature: 0.1-80.0 degrees Celsius Fahrenheit: 32.0-176.0 Accuracy: ±2% Size: 154mm * 30mm * 14mm Yellow characteristics: This PH meter is an ideal device for determining the acidity or alkalinity of liquids. It is very easy to use-just immerse the electrode The reading is automatically displayed. 0.01pH In terms of resolution, you may get higher accuracy than other pH meters. The electrode design has higher durability to provide longer product life. Application scope: production and drinking of purified water, electroplating liquid, boiler water, fish tank water, swimming pool water, photographic washing liquid, well water, deep water, laboratory, aquaculture, food processing, etc. feature: 1. Fast and accurate reading: Just open it and immerse it in liquid to read the display, without using color cards or test strips; the large LCD display makes it easy to read. 2. Automatic calibration: without any screwdriver, just press the automatic calibration button to complete the calibration (not including buffer powder) 3. ATC function: automatic temperature compensation function can automatically resolve temperature changes; the complete pH measurement range is 0-14, and the pH resolution is 0.01. 4.Portable design: Hand-held pen type and compact suitcase, so that it can be conveniently placed in a pocket or bag, and can be carried anywhere. 5. Wide range of applications: very suitable for home and laboratory pH testing applications, including drinking water, swimming pools, aquariums, hydroponics, etc.