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Both. The scale I got from amazon is an impedence device. I downloaded their app and it’s synched to the scale. I get a report on the app. Weight, BF, lbm, visceral fat, water, protein, bone mass and it calculates bmr. The scale at the gym is just a lot more expensive and theoretically more accurate. Again, I’m not overly concerned with absolute accuracy. I use the scale to measure relative accuracy. As long as I measure under the same conditions, the scale is pretty reliable.