Calibration laboratories are generally responsible for calibrations of industrial instrumentation. Johnson combines baritone vocals with laid-back acoustic instrumentation. A wide range of other percussion instrumentation are used in reggae. Siemens also supplied instrumentation and control systems. More instrumentation and more in depth musical compositions. It requires improved instrumentation of the equipment. Spectris plc is a supplier of precision instrumentation and controls. Scottish-based companies have strengths in information systems, defence, electronics, instrumentation and semiconductors. The mix laid the original 1994 vocals over new electronic instrumentation. All weapons were aimed optically with targeting computed by analog electrical instrumentation. It features Mars singing and a piano accompaniment as the sole instrumentation. Analog avionics began to appear, replacing older "steam-gauge" cockpit instrumentation. The flight deck now has 'glass' instrumentation and navigation computer automation. It is a very popular because of its melodious instrumentation and vocals. Surveying instrumentation and techniques improved over the ensuing centuries.