Product Name: Supplier of High Quality Portable Digital pH Meter Model NO.: ph meter Color: Red/Yellow Brand: HP Weight: 146g Dimensions: 150*29*20 Trademark: OEM Transport Package: Neutral(Blank) Specification: CE Origin: Ningbo or Jinan China HS Code: 84219910 Product Description PH meter is an electronic device used for measuring the PH (acidity or alkalinity) of a liquid.Operation Remove the protective cap. First rinse the electrode with distilled water, and suck it with filter-paper. Turn on PH by "ON-OFF" switch located on the top of battery case Immerse the PH meter electrode in the solution to be tested. Stir gently and wait for the reading to stabilize. After use, switch off PH, use the distilled water to clean the electrode and put on the protective cap.