![4 in1 Water Quality Tester Pen Type Multifunctional PH/EC/TDS/Temp Water Meter Portable Digital Water Conductivity Temperature Monitor: Amazon.com: Industrial & Scientific 4 in1 Water Quality Tester Pen Type Multifunctional PH/EC/TDS/Temp Water Meter Portable Digital Water Conductivity Temperature Monitor: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/41fJ9FvI2EL.jpg)
4 in1 Water Quality Tester Pen Type Multifunctional PH/EC/TDS/Temp Water Meter Portable Digital Water Conductivity Temperature Monitor: Amazon.com: Industrial & Scientific
![ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd. ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.](https://www.tekcoplus.com/cdn/shop/products/6-Tekcoplus-water-quality-meter-ECTK-231-Dimension_1024x1024.jpg?v=1553656395)
ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.
![ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd. ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.](https://www.tekcoplus.com/cdn/shop/products/4-Tekcoplus-water-quality-meter-ECTK-231-Set_1024x1024.jpg?v=1553656395)
ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.
![ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd. ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.](https://www.tekcoplus.com/cdn/shop/products/8-Tekcoplus-water-quality-meter-ECTK-231-Calibration_1024x1024.jpg?v=1553656395)
ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.
![3-in-1 PH/EC/TEMP Water Quality Detector Wireless WiFi Online PH Meter EC Controller Professional PH Controller with Relay Plug - AliExpress 3-in-1 PH/EC/TEMP Water Quality Detector Wireless WiFi Online PH Meter EC Controller Professional PH Controller with Relay Plug - AliExpress](https://ae01.alicdn.com/kf/S5ddbff3f75924715b920836f49b339bbZ.jpg_640x640Q90.jpg_.webp)
3-in-1 PH/EC/TEMP Water Quality Detector Wireless WiFi Online PH Meter EC Controller Professional PH Controller with Relay Plug - AliExpress
![ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd. ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.](https://www.tekcoplus.com/cdn/shop/products/5-Tekcoplus-water-quality-meter-ECTK-231-Parts_1024x1024.jpg?v=1553656395)
ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.
![ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd. ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.](https://www.tekcoplus.com/cdn/shop/products/1-Tekcoplus-water-quality-meter-ECTK-231-Preview_1024x1024.jpg?v=1553656395)