Feature: 1. Clear LCD display screen, large screen display, clear numerical values, easy to read. 2. Using three button batteries, and battery replacement is convenient. 3. High sensitivity electrode probe, high accuracy in measuring water quality, automatic temperature compensation, reducing errors. 4. There are four different modes for the test pen, and pressing the MODE/CAL button can switch between different modes. 5. Mode memory function, default mode for each startup is the lastmode used before shutdown. Specification: Suitable for water quality testing, such as drinking water testing, hydroponic cultivation, laboratory, aquaculture, sewage treatments, etc. Features: Clear LCD display screen, large screen display, clear numerical values, easy to read. Using three button batteries, and battery replacement is convenient. High sensitivity electrode probe, high accuracy in measuring water quality, automatic temperature compensation, reducing errors. There are four different modes for the test pen, and pressing the MODE/CAL button can switch between different modes. Mode memory function, default mode for each startup is the lastmode used before shutdown. Specifications: Color: green+white Material: plastics ORP measuring range: 0-1999mV H2 measuring range: 0-10000ppb Chlorine measuring range: 0-4.00ppm Temp measuring range: 0-60℃ / 32-140℉ Battery: 3 * LR44 button battery, 1.5V, 160mAh Item size: 186 * 37 * 23mm / 7.3 * 1.5 * 0.9in Package size: 280 * 80 * 45mm / 11.0 * 3.1 * 1.8in Package weight: 160g / 5.6ounce Packing List: 1 * Water Testing Pen Package List: Packing List:1 * Water Testing Pen