This product is a single quality multi-functional water pen YY-400 electrode. It can be used as a replacement accessory. It can be used with the water quality test pen to detect pH, orp, oxidation reduction potential, H2 enrichment and temperature.It has high performance, fast numerical stability, and precise calculation results.Specification:PH test range: 0.01-14. 00phResolution: 0.01pHAccuracy: +/- 0.05pHORP test range: +/- 999mVResolution: 1mVAccuracy: +/- 2mVH2 test range: 0-2400ppd; 0.001-2.400Resolution: 2ppb; 2ppmAccuracy: +/- 10ppb; +/- 10ppmTemperature test range: 0.1-60.0 / 32.0-140Temperature accuracy: +/- 0.5Temperature resolution: 1 /Waterproof rating: IP67Temperature compensation: automatic temperature compensation 0-60v1 ATCWorking environment: 0 to 60.0 (32.0-140 ); RH 100%Note: Every time you use it, you need to clean the electrodeColour: whiteMaterial: plasticPackage Contents:1 x Detection Pen ProbeOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.