Product description <img alt="Water Quality Test Pen" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/ade9dd3b-5d12-462e-8883-8b760a324a5a.__CR0,0,970,600_PT0_SX970_V1___.jpg/> <img alt="Water Quality Test Pen" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/fa846ce1-ce1a-4181-bf69-3c565f7d32ed.__CR0,0,1601,1601_PT0_SX300_V1___.jpg/> Applicable Scenarios: Suitable for water sources, aquariums, hydroponics, hot springs, swimming pools and other water systems.

<img alt="Water Quality Test Pen" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/f6eb2a32-66ce-4203-84fa-3579f9b1b15d.__CR0,0,1601,1601_PT0_SX300_V1___.jpg/> How to Use: After Installing the battery, open the cover and put the measuring head into the liquid to be measured, and the value can be displayed in a moment.

<img alt="Water Quality Test Pen" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/62addc90-ccf6-4e1f-bd55-e6a7c91ab2dc.__CR0,0,1601,1601_PT0_SX300_V1___.jpg/> Package List: 1 x Water Quality Test Pen (Battery Not Included)1 x Manual1 x Screwdriver1 x Protective Shell <img alt="Water Quality Test Pen" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/33f658af-ab87-473b-ab6e-c93ba69c4fd4.__CR0,0,970,600_PT0_SX970_V1___.jpg/> <img alt="Water Quality Test Pen" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/5a5a5487-b7db-435e-a54d-bf644ac28a4c.__CR0,0,970,600_PT0_SX970_V1___.jpg/> <img alt="Water Quality Test Pen" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/d34a308b-2c91-4034-90ee-7a116d6c0a6c.__CR0,0,970,600_PT0_SX970_V1___.jpg/>