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Contact Supplier| display screen:          segment liquid crystal display control   standard:            power/confirm key, left/right key measuring method            flow: turbine sensor volume:                flow integration measuring range   volume range:           0.01l ~ 9.99l air flow range:          30~999l/min measurement accuracy      volume:               ± 0.1l or ±3%,whichever is greater flow:                  ±5% or 0.2l/s,whichever is greater power source            aaa1.5v×2 alkaline batteries memory                600 measurements with data and time operation temperature    10oc~40oc operation relative humidity: ≤75% atmosphere pressure         500hpa~1060hpa |