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+whiteMaterial: plasticsORP measuring range: 0-1999mVH2 measuring range: 0-10000ppbChlorine measuring range: 0-4.00ppmTemp measuring range: 0-60 / 32-140Battery: 3 * LR44 button battery, 1.5V, 160mAhItem size: 186 * 37 * 23mm / 7.3 * 1.5 * 0.9inPackage size: 280 * 80 * 45mm / 11.0 * 3.1 * 1.8inPackage weight: 160g / 5.6ouncePacking List:1 * Water Testing PenPackage List:Packing List:1 * Water Testing Pen