... sensor, sensitive, precise, easy to clean and durable Dimension:284mmX210mmX72mmWeight: 1.7kg(net)The portable pulmonary function measurement instrument can be ... : 0L ~ 9LFlow velocity range: 0 ~ 14L / smeasurement accuracy Capacity:0L ~ 1.6L (± 50ml) 6L ~ 9L (± 3%) Flow rate: 5% or 0 ... .2L / s Respiratory rate:4 / 20 ~ / min (± 1 / min) 20 / 60 / min (error: ± 5%) measuring time limit and ...