Cole-Parmer”sline of impact-resistant polycarbonate flowmeters is designed fornoncaustic liquids and air. Direct-reading flowmeter models 32900-02 to-54 are economically priced and feature scales in both English andmetric units. They have a 10-to-one turndown ratio and are designed tomaintain pressures to 100 PSIG and temperatures to 150 F.  Liquidflow range is 0.2 to 40 GPH. Air flow range is 0.2 to 60 SCFH. Flowmeter accuracy is +/- 4 percent full scale.