Features: The different between water and energy water can be identified by placing the pen in the solution to be test. The pen head emits minerals energy water, while water does not emit light. The BIO testing pen is used to detect the different between water, energy water, and minerals water. Generally, traces and minerals in water can increase the energy in the water. BIO tester pen is widely used for energy detection of various energy water machines, and can also be used to check thepurity of water and wine. The BIO testing pen is easy to operate and convenient to carry and use. Scope of use: Testing of water such as energy water machines, functional water machines, electrolytic water machines, ultrafiltration water purifiers, water machines with alkalines or mineralized filter, energy cups, etc. Specifications: Material:ABS Size:Approx.124mm/4.88''x18mm/0.71'' Package Includes: 1x Water Quality Tester note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.