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"PDFM." Fullformexpand.com, https://www.fullformexpand.com/pdfm/portable-doppler-flow-meter. Accessed 20 Feb. 2026.
Fullformexpand.com, 2026. "PDFM." Accessed February 20, 2026. https://www.fullformexpand.com/pdfm/portable-doppler-flow-meter.
"PDFM." (n.d.). Fullformexpand.com. Retrieved February 20, 2026, from https://www.fullformexpand.com/pdfm/portable-doppler-flow-meter.
PDFM. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/pdfm/portable-doppler-flow-meter (Accessed: 20 February 2026).