All working parts and indicia are visible, meter readings are unobstructed; the outlet swivels 360°

Exposed surfaces within the system are glass, nylon 316 stainless steel (float ball and spring) and FETFE (silicone and ethylene-propylene rubber o-rings also available). Nylon is suitable for use from pH 3 to 14, unaffected by most ordinary solvents and chemicals except oxidizing acids and amines. The components are readily disassembled for cleaning or interchanging metering tubes merely by unscrewing the threaded metering tube cap, and/or the needle plug. Supplied in plastic case convenient for storage.

By inverting the metering tubes, the outlet can be changed to inlet. This compact needle valve rotameter is used to regulate and measure flows conveniently. Pressure tight to 2Kg/cm2 or more (air).Flow rates from 5 to 50,000 mL/min. air; or 0.1 to 500 mL/min. water using six interchangeable tubes with fused-on 70mm scales (see table 1). Each tube is furnished with a 316 stainless steel and Pyrex glass ball float, except where noted, average calibration curves ±5% of flow; one set of correction curves for temperature, pressure and specific gravity.