Features: Online water quality detectors: value detection for tap water online, with builtin single way interfaces. Digital display screen, clear numerically values for easy reading. Detachable sensorings interfaces, easy to carry. Detachable High Sensitivity Probes: A high precise and sensitive sensings probes that detects water quality and automatically compensates for temperature, reducing errors. The overall designs is precise, and the back is easy to install and use with adhesive sticker. Specifications: Material:ABS Ranges:0-9990ppm Accuracy:±2% Size:Approx.76mm/2.99''x47mm/1.85''x20mm/0.79'' Package Includes: 1pcs Monitors note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.