RTW is a Cologne, Germany-based manufacturer of professional audio metering and monitoring equipment, founded in 1965 by Rudolf Twelker as a service operation for radio and television gear before evolving into a dedicated audio-systems developer. The company built its reputation in broadcast and post-production with the Peakmeter line — particularly the gas-plasma-tube units that became fixtures in radio and TV studios from the 1970s onward — and has since helped shape international loudness standards through participation in ITU and EBU working groups.

Its product range centers on visual audio monitoring for broadcast, production, post, and quality control. The TouchMonitor family (TM3 Smart, TM7, TM9) introduced touch-driven multichannel metering, while the more recent TouchMonitor 5 and TouchControl 5 target Audio-over-IP workflows with Dante and Ravenna connectivity, supporting configurations up to 9.1.6. The MM3 MusicMeter is aimed at music, voice, and multimedia producers, and the TMxCore platform extends the lineup toward immersive audio and speech-intelligibility analysis. RTW also ships software equivalents such as Loudness Tools and the Loudness Quality Logger for plug-in and standalone use, all conforming to standards like EBU R128, ITU-R BS.1770, ATSC A/85, and Netflix-style dialog-gated delivery specs.

RTW has 3 products cataloged on Equipboard, including Active & Passive Monitors. Their gear is featured by 2 artists, with the strongest followings in Electronic. Notable users include Richard Devine and Driftmoon.