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The WDM9502 RCD/LOOP Circuit Analyzer Tester is a high-precision tool designed for electricians and safety inspectors to assess the functionality of RCDs and measure loop impedance in electrical circuits. This versatile tester checks RCD trip time and current, ensuring the correct operation of safety devices. With a line voltage range of AC 85265V and the ability to detect neutral ground voltage (AC 010V), this tester is suitable for a wide range of electrical systems. It measures peak line voltage from AC 121374V and supports line frequencies from 4565Hz, making it adaptable to different environments. The RCD trip time can be tested from 1ms to 6.5s, with an RCD trip current of 30mA. Featuring True RMS technology, the tester ensures accurate readings, even for non-sinusoidal AC waveforms. The data hold function allows users to freeze readings for easy recording, while the LCD display with a backlight ensures clear visibility in various lighting conditions. Compact and portable, it is powered by 6 AAA batteries (likely included) and weighs only 254g. The tester comes packaged in a color box for easy storage and retail sale.