The Multi-tool is the general term used for the mining tool and weapon that every player possesses. Its primary functions are to locate and harvest resources for the player. Players may own up to three Multi-Tools, and can switch the active Multi-Tool via the Quick Menu in the Utilities section.
Players begin the game with a Multi-tool. New models may be purchased at the Multi-tool merchant within every Space station. They may also be purchased on every Space Anomaly and at every minor outpost attached to a landing pad. Some NPCs may gift you a new Multi-tool. These Multi-tools will be damaged and require a number of repairs, similar to what is needed to restore a crashed starship.
Each Multi-tool has its own price in units associated with it. When you purchase a new model, the price of your current model will be deducted from its purchase price. Every time you receive a new Multi-tool you will lose all installed technology upgrades (though you will have a chance to dismantle technologies on your old Multi-tool for a partial resource refund before you trade it in for the new one).
After manual saving/reloading, multi-tools found in space stations and planets may change their models, but not class or number of slots (for pistols it can't be more than 10; Small Rifles max at 16; Large Rifles max at 24).
Each planet/moon and space station in a system has its own pool of 2-4 multi-tool models. Saving and loading on the surface of a planet switches the pool from which that system picks multi-tools. Using a Base Teleport Module, a Portal, or warping into a system also counts as loading and changes the loot-pool.