Features: Accurate Adjustment This knob type signal device allows for control of current output, meeting different equipment needs. User Friendly With its easy operate and stable performances, this signal device is suitable for various applications in the field of control system. Suitable for Professional For engineers, technicians, and professional who require current signal testing and calibration. Convenient Usage Perfect for testing and calibrating various current signal device in factory, laboratory, and instrument maintenance. Essential Tool This signal device offer convenience and reliability, making it a essential tool for accurate current signal testing and calibration. Specifications: Supply Voltage: 9-28VDC Output: 0-20mA Display Mode: Real Current/0-100%/0-50Hz Sampling Resistance: Less than 300ohms at 12V, Less than 900ohms at 28V Display Accuracy: 0.01mA Output Accuracy: ±0.5% Size: About. 80x42x40mm/3.15x1.65x1.57in Package Includes: 1pc Signal Generator note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.