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. 00ph Resolution: 0.01pH Accuracy: +/- 0.05pH ORP test range: +/- 999mV Resolution: 1mV Accuracy: +/- 2mV H2 test range: 0-2400ppd; 0.001-2.400 Resolution: 2ppb; 2ppm Accuracy: +/- 10ppb; +/- 10ppm Temperature test range: 0.1-60.0 / 32.0-140 Temperature accuracy: +/- 0.5 Temperature resolution: 1 / Waterproof rating: IP67 Temperature compensation: automatic temperature compensation 0-60v1 ATC Working environment: 0 to 60.0 (32.0-140 ); RH 100% Note: Every time you use it, you need to clean the electrode Colour: white Material: plastic Package Contents: 1 x Detection Pen Probe Only 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.