Key benefits Replaces the need for two separate multimeters: measures DC current (high-side or low-side), bus voltage, and automatically calculates power. Accurate and flexible: performs measurements with over 1% accuracy across a wide range of voltages, currents, and temperatures. Easy digital integration: delivers measurement data in a user-friendly format over I2C and supports 3V or 5V logic. Important features and performance DC-only operation: measures bus voltages up to +36VDC. Not suitable for AC voltage. High-precision low-value shunt: integrated 2 milliohm (0.002 ohm), 0.1% shunt resistance minimizes voltage drop; the resistance is so low some multimeters register it as a short. High-resolution ADC: an internal 16-bit ADC measures the voltage across the shunt and provides a current resolution of about 1.5 mA. Flexible placement: supports both high-side and low-side current measurement. In high-side configuration, bus voltage and power calculation are available directly. For low-side bus-voltage measurement, remove the jumper between V+ and VBUS and connect the VBUS pin to the voltage bus. Compatibility and usage notes Logic compatibility: works with 3V and 5V logic levels. Communication: I2C output provides convenient digital access to voltage, current, and calculated power values. Voltage limit: measures up to +36VDC; do not use with AC. Practical applications Battery and pack monitoring: measure current, bus voltage, and power on Li-ion or lead‑acid packs and track performance under load. Embedded system and USB power profiling: log currents and power consumption of development boards, sensors, and peripherals with I2C readout. Motor and small-vehicle testing: monitor DC motors and drive electronics (within the +36VDC limit) to detect stalls, inrush, and steady-state power draw. What this solves Eliminates cumbersome manual measurements by combining voltage, current, and power sensing in one board with digital output. Reduces measurement error and circuit disturbance thanks to the very low-value, high-accuracy shunt. Simplifies integration into data-logging or control systems via standard I2C and wide logic compatibility. Additional reminder To use low-side bus-voltage sensing, cut the jumper between V+ and VBUS and connect VBUS to the measured bus as described above.