The 3329H-1-221LF is a 1/4" round single-turn cermet industrial trimming potentiometer (Trimpot) manufactured by Bourns with sealed construction and five standard terminal style options. This device features a resistance value of 220 ohms with ±10% tolerance, an adjustment angle of 240° nominal, and infinite resolution for precise voltage and resistance adjustments (±0.05% voltage adjustability, ±0.15% resistance adjustability). The potentiometer operates over a temperature range of -55°C to +150°C with a temperature coefficient of ±100 ppm/°C, a power rating of 0.5 watt at 85°C (300 volts maximum), and meets MIL-PRF-22097 and MIL-PRF-39035 specifications. It is RoHS compliant with 100% tin-plated (LF) termination, making it suitable for industrial applications requiring reliable, sealed trimming potentiometers in instrumentation, signal conditioning, and precision calibration circuits.