The FR FI series RF admittance level meter adopts advanced RF admittance technology to overcome the defect of not being able to eliminate the influence of conductive hanging materials. It can be used for liquid, oil, and solid level measurement, with no movable parts. It is not affected by water vapor, dust, or condensation, and has the advantages of long-term stable and reliable operation, high sensitivity, good linearity, high temperature resistance, and high pressure resistance.