I-Full Waiver is a Logger for electrical signal designed for advanced Time Domain Induced Polarization, Resistivity and SP continuos measurements. It is connected in series on the AB injection line, it measures and logs very accurately the injected current I of AB. Compactness: light, discrete and easy to setup on the field, even on remote areas. This autonomous logger does not need any operator during the acquisition. I-Full Waver is connected close to the transmitter or close to any injection electrode. An internal gps, very accurate and providing PPS signal (one pulse per second) allows to store all time series with time information. Internal memory can store up to 1 month. Then data can be transferred to an USB key.