Characteristics: The multifunctional meter with digital display can measure AC voltage and current, active power, apparent power and power factor simultaneously. Adopting high strength fireproof material, safe and reliable. High measurement accuracy, stable performance. Compact size and sturdy design, easy installation. No external AC transformer is required Do measure current in the 99.9A range. Simply run the measuring loop wire through the small round hole on the right side of the meter to complete the measurement. Specification: Measuring voltage: AC80-300V, AC200-450V (optional) Measuring current: AC100A (additional transformer is required if it is greater than 100A) Power supply: no power supply required Measurement accuracy: 0,5% Overall dimensions: 54 * 80 * 64 mm / 2,1 * 3,1 * 2,5 inches Installation: installation on din 35mm rail List of packages: 1 * multifunction meter; In new and old style they are sent randomly!