CheckMeter 2.3 genX from MTE Meter Test Equipment AG is a portable test tool for calibrating and checking the accuracy of single-phase and three-phase electricity meters. This device with 0.2 measurement class accuracy allows users to test energy meters (active, reactive and apparent) and also has the ability to analyze electrical parameters, display diagrams and analyze harmonics. This device uses direct voltage inputs and a UCT (Universal Current Transducer) input, which allows it to work with various current sensors such as clamps or high voltage current sensors. Its measuring voltage ranges from 0 to 300 volts and current from 1 milliamp to 3000 amps. These capabilities make it possible to use it for various industries and electricity distribution operators in accurate testing of meters on site. Due to its small size, light weight and rubber protection, this device is suitable for use in various environmental conditions. Also, additional options such as CALegration software for calibration and various clamp tools are available to make it more efficient.