Shown here is the overview of trimmer potentiometers. There are generally 3 types of trimmer potentiometers; open type, dustproof type and sealed type. All of Nidec Copal Electronics trimmer potentiometers are the sealed type. The main features of sealed trimmer potentiometers are: dustproof and moisture proof, flow soldering available (with exceptions), PCP washing available, and tamper proof seal compatible. These products are available with thru-hole or surface mount PC terminals and single turn or multi-turn trimmer potentiometers.