As you can see there are a host of different styles and shapes of the common tweezer and all of them have their uses.
There are two common forms of construction of Tweezers: two fused, angled pieces of metal, or one piece of metal bent in half. The later is cheaper, but gives a weaker grip. The former is a little bit more expensive, but provide for a stronger grip.
Most commonly tweezers are made out of metal to improve grip and durability, but there are companies that make them out of plastic and composite materials.
Most tweezers are all the common squeeze to close types, the type of tweezers that I prefer for hobbying are Cross-lock tweezers
Cross-lock tweezers work by applying pressure in the resting state so to speak. Useful for holding items during solding, glueing, or other operations. Unlike traditional tweezers, cross-locking tweezers open when squeezed and close when released, “locking” onto the item being held. Theses guys become really handy when trying to get a tricky bit glued into a tricky position. We here at Models-workshop love our cross-locks, I just find that getting fiddly things into place during a difficult conversion. They also are really handy if you paint your models in pieces as they make nice holders for small pieces.
The last thing that I am going to cover in this tutorial are Hemostats. The hemostat has handles that can be held in place by the locking mechanism. The locking mechanism is typically a series of interlocking teeth, a few on each handle, that allow the user to adjust the clamping tension of the pliers. So basically the Hemostat is a locking tweezer. They have pretty small tips allowing you to get into hard to reach places, while hold the piece youare working on very firmly. My only real issue with hemostats is that with the amount of force applied between the tips you can damage soft plastics and resin if you aren’t careful.
In conclusion, it is my belief that every modelers tool kit can benefit from a having a variety of different styles of tweezers. You never know when that diamond nose or bent nose tweezer will be come in handy. Just about any type of tweezer that you could ever want or use are available online from variety of jewelry supply stores. You can also pick most of these up at most locale hobby and craft stores. Hemostats are available anywhere that sells medical supplies and equipment.