Product Description This is a newly developed spirometer. Size of product is 30/50*155mm. This product has passed audit of CE. Different colors available. Minimum order amount: 1000 PCS. Main technical data: Technical Specification Material: Recyclable ABS plastic Accuracy: +(-)10L/min or +(-) 10% of the reading Repeatability: +(-)5L/min or +(-) 5% of the reading Altitude effects on Lowers readings by approx. 5% per 1000m The Peak Flow Meter (decreased air density increases PEF by approx 5% per 1000m Highest resistance to flow: 0.00384 kpa/L/min@720 L/min Measurement Range: 50-800 L/min BTPS Storage Conditions: Temperature: 10-35 C degree; Relative hunidity: 30%-75% Peak Flow Meter: ENISO13826; ATS/ERS Performance standards: AS/NZS4237; NHLBI Frequency response: Profile A/B difference less than 15 L/min/15% (Annex B, EN ISO 13826: 2003)