The SM-30 is a small magnetic susceptibility meter. Thanks to its high sensitivity it can measure sediments and rocks with extremely low levels of magnetic susceptibility. In addition, we 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 nonvolatile memory and to recall them later. The 251th value (the last measured one) is automatically displayed after the SM-30 is switched on. If no button is pressed for 3 minutes, the instrument switches off automatically. The SM-30 has a beeper indicating intervals in which the information from the rock is picked-up. The SM-30 is powered by two coin lithium batteries CR2430. If the instrument is not used too extensively, the batteries may last for years thanks to their low rate of self-discharge.