The MTE CheckMeter 2.3 device you see in the picture is a professional tool for testing and calibrating single-phase and three-phase electricity meters. This device is used to check the accuracy of electricity meters and is specifically designed for testing energy meters at the installation site. Features and capabilities of the device 1. Voltage and current inputs: The device has voltage inputs marked U1, U2 and U3 to measure the voltage of different phases. There are also N and LINE inputs for current. These inputs are set to test three-phase meters. 2. Voltage range: According to the label on the device, this device can measure voltages between 46 and 300 volts in the frequency range of 47 to 63 Hz and is in the CAT III safety category, which makes it suitable for use in industrial and commercial environments. makes 3. Safety and quality: In accordance with CAT III safety standards, this device has a high build quality and can be safely used in low and medium voltage networks. 4. Applications: CheckMeter 2.3 is designed for power distribution companies, technical service units, and other electrical industry professionals to check the accuracy of meters and measuring equipment. Main applications • Testing and evaluating the performance of electricity meters at the installation site • Analysis and investigation of electrical parameters such as voltage, current, active and reactive power • Checking the coordination and proper functioning of energy measurement systems in industrial and commercial environments This device is a suitable choice for electrical technicians and engineers in various industries due to its high accuracy and ease of transportation.