This style digital pen is a great tool for any aquarium, fishing industry, swimming pools, school labs, food and beverage, etc. and it is fine for all basic water testing applications. Features: Let you no longer worry about whether your ph meter is accurate, the 3 calibration packages we give can help you check whether our ph meter is accurate. The small size of the ph meter we designed allows you to easily put it in your pocket, so you can take measurements anytime and anywhere. This will help you see if you are taking it to the pool, on a trip, to the beach or to a campsite. As a tool to improve the quality of life. It can be used for drinking water testing, swimming pools, aquarium PH balance, RO system, spa or hydroponics. Basically, all environments that need to test the PH value can use this tester to get accurate data. The PH tester has sensitive electrode sensors, just press "ON", just a few seconds for the results to appear on the screen. You no longer need to care about the temperature of liquid testing, as the PH meter has automatic temperature compensation that adapts to the water temperature and water quality. Specifications:Resolution: 0.01 pHBome: PH 0.05Working Temperature: 0°C-60°CBarate: 2*1.5V LR44Product Size: 155*31*18mm/6.1*1.2*0, 7inPackage Size: 167*52*30mm/6.6*2.0*1.2in Package Weight: 110g/3.9ouncePacking List:1*PH TesterMany questions about Dropshipping services are following:1. How many orders can you handle per day? We are a large company in Shenzhen, China, with a large warehouse that can handle large orders every day. We ship countless packages every day. We can guarantee the order you request.2. How fast can you process orders? We will arrange the shipment as soon as possible after you pay for your order. Priority delivery for dropshipping order3. Can you ship an order without any receipts, invoices and promotional offer inside the package? Absolutely! No invoices, receipts, promotional offer if you leave notes on the order (if you want, we can deliver.)4. If you need other products? We can supply most of the products you need as much as possible1If you have any other questions, please feel free to . We are very grateful for your cooperation with you.5. We can support Dropshipping of CSV/Excel files.6. There is no limited inventory to fulfill orders on a daily basis