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This voltage and current singal generator is the most commonly used electrical test instrument for electrical engineering and technical personnel during the installation, debugging, overhaul and maintenance of electrical equipment on site. Pluggable terminal blocks, safe and convenient wiring. 4-digit high definition digital tube, the display brightness is uniform and adjustable (1-8 brightness). Aluminum knob cap, electroplated buttons, high quality film, charging indicator, battery switch. DC 15-30V external power supply, which can share the 24V power supply of PLC and other equipment.