1、Wide voltage and current measurement range 2、0.5 inch LED digital tube display can provide accurate reading. 3、High accuracy, easy and convenient to operate. 4、Fast measuring speed, the measuring speed is about 2 times per second 5、Used for monitoring the operation situation of appliances. Features: 1. Wide voltage and current measurement range 2. 0.5 inch LED digital tube display can provide accurate reading. 3. High accuracy, easy and convenient to operate. 4. Fast measuring speed, the measuring speed is about 2 times per second 5. Used for monitoring the operation situation of appliances. Specification: Condition: 100% Brand new Model: D52-2042 Measuring Range: AC voltage: AC200-450V, AC current: AC0-99.9A Measurement Accuracy: 1% ±2 digits Display: 0.5 inch LED digital tube Measuring Speed: About 2 times per second Installation Method: Rail type Size: Approx. 54 x 80 x 64mm / 2.1 x 3.1 x 2.5in Package List: 1 x Digital Voltmeter Ammeter 1 x Chinese English User Manual Instructions for Using: The voltage and current dual display meter displays the measured AC voltage and AC current simultaneously on the meter. The measurement range is less than 99.9A. No external AC transformer is needed. Simply wire the measuring circuit through the small hole on the right side of the meter. Current measurement, measuring current greater than 99.99A requires external transformer