Liquid PH Sensor

• Heating voltage: 5VDC
• Working current: 5-10mA
• The detection concentration range: 0-14pH
• The detection range of temperature: 0-80 centigrade
• The response time: ≤ 5S
• Stability time: ≤ 60S
• Power consumption: ≤ 0.5W
• The working temperature: -10~50 centigrade (the nominal temperature 20 centigrade)
• Working humidity: 95%RH (nominal humidity 65%RH)
• Service life: 3 years
• Size: 42mm x 32mm x 20mm
• Weight: 25g
• The output: analog voltage signal output

BNC Electrode PH Probe

• The pH electrode has a single cylinder that allows direct connection to the input terminal
• of a pH meter, controller, or any pH device which has a BNC input terminal.
• The pH electrode probe is accurate and reliable that can gives almost instantaneous readings.
• pH range: 0-14 pH
• Temperature range: 0-60℃
• Zero-point: 7 ± 0.5pH
• Alkali Error: 0.2pH
• Theoretical Percentage Slope: ≧98.5%
• Internal Resistance: ≦250MΩ
• Response Time: ≦1min
• Operating Temperature: 0-60℃
• Terminal Blocks: BNC plug
• BNC Connector suitable for most pH meter and controller.
• Suitable for wide range of application: Aquariums, Hydroponics, Laboratory etc...

You will also need pH Probe Tester Buffer Powder for calibration.

Good tutorial for calibrating the module and reading data: https://www.electroniclinic.com/ph-meter-arduino-ph-meter-calibration-diymore-ph-sensor-arduino-code/

Good video tutorial: YouTube

Without proper calibration (as described in the above tutorial in section "pH Sensor Calibration"), it won't produce correct results.