The idea of buying an inexpensive tool is not a daunting task nowadays. You should think of buying tools as an investment. When it comes to buying tools remember the old adage that a bad worker blames his tools. Always go for quality, forget bargain for the high street discount retailer. If you are seeking high-quality toolcases & cabinets then you can navigate various online sources.
A multimeter is essential for troubleshooting and diagnosing almost anything electrical on the car including the search for a bad connection or a shorted wire.
Air tools including air impact wrench, they can speed up word by removing stubborn bolts and nuts quickly. Air tools require an air compressor for the work that would be a little over the top for an enthusiast but if you are a mechanic will usually have one you can plug into.
High strength impact socket connector for use with air tools in which a higher torque is applied. Standard socket is usually made of vanadium steel and can split or break. Impact sockets are manufactured from molybdenum steel and much stronger. There are many types of automotive tang specialist but a good solid set should you start to allow you to grip round or ribbed bolt.