Features: Multi-functional digital display meter measures AC voltage, current, active power, apparent power, and power factor simultaneously. Constructed with high-strength flame-retardant material for safe and reliable operation. High measurement accuracy with stable performance. Compact design and robust structure for easy installation. No external AC transformer required for measuring current up to 99.9A. Simply pass the wire of the measuring circuit through the small round hole on the right side of the meter to perform the measurement. Specifications: Measurement voltage: AC80–300V, AC200–450V (optional) Measuring current: AC100A (external transformer required for currents exceeding 100A) Power supply: No external power supply required Measurement accuracy: 0.5% Overall dimensions: 54 × 80 × 64mm / 2.1 × 3.1 × 2.5in Installation: 35mm DIN rail Package List: 1 × Multi-Functional Meter Note: New and old styles are shipped randomly