Chauvin Arnoux MTX 3291 [MTX3291] 20A AC / 20A DC, 1000V Metrix True RMS Handheld Digital Multimeter. The Chauvin Arnoux MTX3291 is a digital multimeter with built-in power measurement capabilities. It can measure a wide variety of different electrical parameters, including AC/DC voltage, AC/DC current, resistance, capacitance, frequency, continuity, diode and temperature. It can also calculate resistive power, duty cycle and pulse width. This multimeter has a large size, backlit 70 x 52mm LCD screen with contextual connection reminders. It's an autoranging DMM and has USB communication and Bluetooth functionality to process data on PC (requires SX-DMM software package).