Features: The waterproof pen styles water quality tester with LCD backlights display ensures accurate readings in low light environment, design for outdoor enthusiasts and aquariums maintenance. Crafted from durability ABS, this compactly detection tool features antislip grip, combining laboratory grade precise with ruggeds field usability. Essential for campers verifying stream safety, car owners monitoring tank water, and aquariums hobbyists maintaining optimal fish habitat conditions through regular testing. Deploys effortlessly during fishing trip, basement plumbing inspections, or backyard pool checks instantly water analysis wherever your adventure take you. With auto calibration function and replaceable sensors tip, this pocket sized detectors delivers professional grade water analysis comparable to bulkier equipment, streamlining your liquid quality assessment workflow. Specifications: Component:ABS Case Size:Approx.38x33CM/14.96x12.99inch PHTesting Ranges:-2-16.00ph Resolution:0.01pH Accuracy:±0.01pH Calibration Point:1~3point automatic calibration Auto Temperature Compensation:0~60°C(32-140°F) ORPTesting Ranges:-1000mV~1000mV Resolution:0.1/1mV Accuracy:±0.1%F.S Temp Ranges:0~60℃ (32~140°F) Accuracy:±0.2°C Battery:4x1.5V 3A alkaline battery(not including battery) Package Includes: 1pc Water Meter 1pc Manual 3pcs Calibration Solution（PH4，PH7，PH10.01） 3pcs Inspection jar 1pc Rope 1pc Carry Case note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.