Realtime current measurement using Halleffect sensing for immediate visibility of load and performance. Displays estimated battery capacity with Coulomb counting, providing accurate capacity tracking (Coulomb meter statistics). Wide voltage input range of 9 to 100 V, covering common configurations such as 12 V, 24 V, 36 V, 72 V, and 80 V. LCD display supports multiple battery chemistries, including Liion, LiFePO4, and Leadacid, for versatile use across applications. Use scenario: offgrid solar and energy storage systems where monitoring current draw and remaining capacity helps manage battery health and daily planning. Use scenario: home or small business backup power (UPS or portable power stations) requiring clear readouts of current and remaining capacity for reliable operation. Use scenario: vehicle, marine, or recreational power systems, including ebikes, boats, or RVs, that use Liion, LiFePO4, or Leadacid packs and benefit from a wide voltage range and precise capacity display.