Features: 100% brand new and high-quality. Split-type: easy to install, the transformer is separated from the instrument, and the transformer can be installed according to the actual position of the measurement. (It can lengthen the lead at the second end of the transformer to reach the ideal installation position). Two-wire system: No need to connect the power supply, red and black lines to measure the voltage at the same time to the meter head power supply (no need to split polarity). Current testing requires no additional purchase of transformer. The instrument is equipped with a high precision transformer. In the watch head, l-set fine-tuning potentiometer can calibrate the voltage and current error by itself. Specification: The range of voltage measurement AC100V-300V The range of current measurement 50A(0.00~49.99A) Display mode Double 0.39 bright LED digital tube Display color(Optional ) Red + red/ red + blue/ blue + blue Measurement accuracy 1% ± 2 digits Display 0.39 inches LED digital tube display Measurement speed about 2 times per second Dimensions 70 * 40 * 30 mm Installation dimensions 68 * 38 mm Power supply line, measuring line length about 150mm "split" transformer lead length about 100mm Working temperature -10 ~ + 50 ℃ Working humidity 10 ~ 80% (without condensation) Working pressure 80 ~ 106 kPa Sunshine No direct exposure Package List: 1 * Current voltmeter head 1 * mutual inductance coil 1 * adapter Note: The wiring sequence of the instrument is: the circuit of the current loop is connected first, the 220V voltage is finally connected, after connecting the 220V power supply, it can not touch any parts and circuits behind the instrument to prevent the danger of electric shock. Split: Green terminal is connected to AC transformer CT, two yellow lines are connected to measure AC voltage, do not connect wrong, connect wrong will cause instrument damage, the responsibility is self-conceited. This meter is designed based on the principle of capacitance step-down, because the higher the frequency, the smaller the impedance of the capacitor, so it is not suitable to be used in high-frequency electronic speed regulation, non-city electric sine wave frequency, or other occasions where there are high-frequency components, otherwise it is easy to burn down! When selecting the range, the larger the range is, the greater the range is, the greater the error is. It is suggested that 1.5 times the actual test value be. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .