Accurately assess the performance of your air ion generators and air purifiers with this compact and easy-to-use Air Ion Tester. Designed to measure high concentrations of negative or positive air ions, this tester helps you verify the correct polarity and estimate the ion concentration output of your devices, ensuring they are functioning optimally. Its small, lightweight design allows for convenient portability and can be worn as a necklace for hands-free use. Key Features: · High-Level Ion Concentration Detection: Measures ion concentrations ranging from 10,000 to 19,990,000 ions/cc, suitable for a variety of negative ion generators, air purifiers, air conditioners, and other high ion concentration sources. · Polarity Identification: Displays both positive and negative ion concentrations, enabling you to confirm the polarity of the ions produced by your equipment. · Clear LCD Display: Features a digital screen with a maximum reading of 1999, showing values in millions for easy readability. · Stable and Reliable Readings: Equipped with a memory function that holds the maximum measured value on the display until the device is powered off, providing stable and easy-to-read results. · Compact and Portable Design: Measuring just 8 x 3 x 1.3 cm and weighing only 89g, this tester is lightweight and easy to carry, with an included wrist strap for added convenience. · Simple Operation: Intuitive on/off switch and clear usage instructions make testing straightforward, while the metal plate sensor ensures accurate ion detection without interference. · Versatile Application: Ideal for testing negative ion generators, air purifiers, air conditioning units, and ion-producing textiles, offering valuable insights into ion emission performance. Specifications: · Power Supply: 2 x 1.5V LR44 button batteries (built-in) · Measuring Range: 10,000 to 19,990,000 ions/cc · Resolution: 10,000 ions/cc · LCD Display: Maximum reading 1999 with polarity indication · Dimensions: 8 x 3 x 1.3 cm (3.15 x 1.18 x 0.51 inches) · Weight: 89g Package Includes: · 1 x Air Ion Tester · 1 x Blue Wrist Strap This Air Ion Tester is an essential tool for anyone looking to monitor and maintain the effectiveness of their air ion generators and purifiers. Its reliable detection range, clear display, and user-friendly design make it perfect for both professional and personal use. Please note that this instrument is qualitative rather than quantitative and best suited for high ion concentration environments above 10,000 ions/cc. Batteries required for operation are not included.