Features: Heating voltage: 5 ± 0.2V (AC DC) Working current: 5-10mA Detectable concentration range: PH0-14 Detection Temperature range: 0-80 ℃ Response time:≤5S Settling Time:≤60S Component Power:≤0.5W Working temperature:-10-50 ℃ (nominal temperature 20 ℃) Humidity: 95% RH (nominal humidity 65% RH) Module Size: 42mm × 32mm × 20mm Output:analog voltage signal output With 4pcs M3 Mounting Holes Note: The color of item might be slightly different from the picture shown, PH Electrode Probe BNC For Arduino: The PH electrode probe is accurate and reliable that can gives almost instantaneous readings. Features: PH range: 0-14 PH Temperature range: 0-80℃ Zero-point: 7 ± 0.25PH Alkali Error: ≤15 mv Theoretical Percentage Slope: ≧98% 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. There is also abundant information on the Internet about its use and codes associated with different applications.