Mastering tools are essential for the final stage of audio production, where a stereo mix is refined for distribution. Key tools include equalizers (EQs) to fine-tune frequency levels and balance the overall sound, compressors to control dynamic range and create a more consistent loudness, and limiters to maximize loudness without causing clipping, ensuring the track meets industry standards. Stereo imagers are used to enhance the stereo width and create a sense of space in the mix. Additionally, dynamic range meters and LUFS (Loudness Units Full Scale) meters are crucial for monitoring and adjusting the perceived loudness and dynamics of the track, ensuring it sounds balanced across different playback systems. While specialized mastering DAWs exist, many engineers use plugins within standard DAWs, focusing on high-quality tools that preserve the integrity of the audio.