An analyser or analyzer is a tool used to analyze data. PicoScope 6 converts a Linux PC into an oscilloscope, FFT spectrum analyser and measuring device. Airopeek is a packet sniffer and network traffic analyser made by Wildpackets. PSpice later included a waveform viewer and analyser program called Probe. Conventional ICP-MS analysis uses a quadrupole analyser, which only allows single-collector analysis. SpaceSniffer is a freeware computer disk space analyser from Uderzo Software for Microsoft Windows platforms. AirMagnet Laptop Analyser and AirMagnet Handheld Analyser are wireless network analysis tools made by AirMagnet. This is related to the sampling rate of the analyser and the FFT rate. The monochromator is usually a concentric hemispherical analyser (CHA). A network analyser is needed to view the resonant frequency. Train operators will be given breath analyser tests when they report for duty. The Cambridge laboratory initially had many different computing devices, including a differential analyser. The differential analyser was not suitable for the solution of equations with exchange. William used the concept to build the Harmonic Analyser in 1886. The complexity of the calculations required the use of a differential analyser.