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In many applications of the magnetic method it is advantageous to have information about the geomagnetic field strength and its gradients. The direct measurement of gradients does not depend on geomagnetic variations or normal field values. Special equipment is required for this purpose. The results of the development and construction of a three-component magnetometer-gradiometer are presented. The device is designed to measure on the earth's surface the absolute values of the three components of the geomagnetic field vector and the corresponding three components of the gradient. Installation of additional measuring sensors in the device – accelerometers, allows you to calculate the orientation of these vectors in space. The device of a magnetometer-gradiometer is described, its functional scheme and operating principle are presented. A set of instrumental errors that occur in the manufacture of three-axis systems of ferrosondes and accelerometers for measuring the components of the geomagnetic field strength and determining the orientation of the device is considered. The paper presents a method for determining instrumental errors and algorithmic correction of information signals coming from measuring sensors to significantly improve the accuracy of measurements. Examples of field tests of the device are given. The presented magnetometer-gradiometer can be used for accurate localization of previously identified ore bodies and determining the details of their structure.