-transmitting frequency as high as 26ghz -non-contacting radar, no abrasion and contamination. -small-sized antenna for easy installation -shorter wave length, better reflection achieved on inclined solid surface -smaller dead zone, better results ensured even in cannikin measurement. -small beam angle and concentrated energy to avoid interferences. -hardly influenced by corrosion and foam -hardly influenced by changes of steam vapor, temperature and pressure -hardly impacted by heavy dust -high snr to ensure performance even under fluctuation -choice for solid media and media with low dielectric constant