Note: The col of the product we ship is the col in the first picture, the specification quantity are shipped accding to the quantity specification described in the title. If you need to change the col style, you need to contact us within 12 hours after placing the der. Our product description: Product Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number inspection date infmation;2.If you have any questions about the item,please provide us the Manufacturing Part Number f checking,your profits will be guaranteed.3.Made of ABS Plastic SS304.4.Used f measuring the gas single-phase non-pulsating flow.5.Measure range is 100-1000ml or min.6.Mainly used to detect control oxygen other gas flow.Specifications:Product material: Plastic SS304Col: Transparent and black and whiteBr name: BQLZRModel: LZM-6Measure Range: 100-1000ml or minWking Pressure: Less than 0.6MpaWking temperature: 0-60 DegreeAccuracy Class: 4 PercentConnection Type: 8mm pagoda connectMedium Applicable: GasOverall Size: 93 x 22 x 68mm or 3.66 x 0.87 x 2.68 inches (L x Dia x Max W)Weight: 77gNote: require vertical installation, water from bottom to top.Package include:1 x Flowmeter Note: Because the model display effect of the monit may be different, there may be slight differences in col, the size is manually measured, there may be an err of 1-2cm, please underst.