If you’re looking for a reasonable, affordable, small and light general purpose set, look no further than the Riester Ri-Mini. This is the set I purchased, and it strikes a balance of price and quality. They’re well-made, durable, and actually work. They use AA batteries, so they’re small and can fit in your white coat easily (unlike their full-size C-battery-sipping cousins). For a pocket set, there’s nothing better.