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doi:10.1039/JS8762900001

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Technical Specifications Sampling Performance Sampling rate: 100 Hz Continuous real-time data acquisition Flow Measurement Range Approximate operating range: 0.15 15 L/min (compatible with cigarette, ECIG, heated tobacco, and waterpipe regimes) Measured Parameters Puff duration Puff volume Peak and mean flow rate Interpuff interval Session-level aggregate metrics Power Requirements USB-powered during standard operation 12 V external supply used for calibration procedures Physical Dimensions Instrument enclosure: 6.3 in 4.1 in 2.1 in External computer required for data recording and analysis Research Use Cases & Study Workflow eTop was developed for sustained laboratory research use, prioritizing measurement consistency across studies and product categories