#For processes that produce homogeneous batches (e.g., chemical) where repeat measurements vary primarily because of measurement error
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Produced by Humphry Bowen, the reference material called Bowen's Kale was used for the calibration of early scientific instruments intended to measure trace elements in the 1960s.
A peak-reading electrical instrument or meter is one which measures the peak value of a waveform, rather than its mean value or RMS value.