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All in all, great features and performance for a low cost TENS unit. Our rating: / 10 | See reviews and ratings on Amazon. 9. truMedic TM-1000PRO TENS Unit. Simple to use TENS unit, ideal for a beginner. If you’re new to TENS and looking for your first unit then the truMedic TM-1000PRO is a solid choice. Radar Cross Section is measurement whose units are surface area, typically recorded in square RCS is a quantity that can change several orders of magnitude as the angle between the radar and the target varies, usually the base 10 logarithm of the linear RCS is used to show the RCS in plots. It is routine to see the RCS represented this way in dBsm, or decibel square meters.