The SM-30 is a small magnetic susceptibility meter. Thanks to the high sensitivity, it can measure sediments and rocks with extremely low level of magnetic susceptibility.
In addition, it can distinctly measure diamagnetic materials like limestone, quartz and also water. The SM-30 is controlled by three push buttons. One of them serves to save up to 250 measured values into non-volatile memory and to recall them later. The SM-30 has a beeper indicating intervals in which the information from the rock is picked-up.
The SM-30 is powered from two coin sized lithium batteries (CR2430). If the instruments are not used too extensively, the batteries may last for years thanks to their low self-discharge.
Please see brochure here: