Feature: 1. TRMS MEASURE AC VOLTAGE: This circuit analyzer is a special test device designed for rapid fault location of AC low voltage distribution lines, which has the characteristics of simple operation and accurate measurement, and can detect multiple problems on a line, such as electric shock, electrical fire, and abnormal operation of equipment 2. VOLTAGE DROP (VD) MEASUREMENT: A dummy load should be used in the circuit to measure the load phase voltage and then calculate the voltage drop. Circuit analyzer meter measure voltage drops at 5A, 8A, and 10A loads 3. MULTI FUNCTIONS: This circuit analyzer measure phase voltage, neutral, ground voltage, peak voltage, and frequency. Measure phase(with wire), neutral line, ground conductor impedance. Recognize 3 wire socket connection patterns(left neutral, right live, grounded) 4. RESIDUAL CURRENT DEVICE(RCD) TEST AND GFCI TEST: Circuit tester is used to test the reliability and response time of residual current device, and test the reliability and response time of GFCI action 5. WITH BACKLIGHT: The circuit LCD analyzer has backlight function and data retention function, and is powered by 6 AAA batteries(not included) Specification: Item Type: Circuit Analyzer Material: ABS Battery: 6 x 1.5V AAA battery(not include) Frequency: 45.0-65.0Hz With Live Line, Neutral Line, Ground Line Impedance: 0.00~3.00Ω. Package List: 1 x Circuit Analyzer1 x Power Cord1 x User Manual1 x Storage Bag Note: Please note that due to air transport controls, this product does not contain batteries.