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The instrument is fast. Measurements are made quickly and easily as follows:

Simply wet the test site (usually by the last rib) with a coupling fluid, such as cooking oil, press the button to turn the instrument on and apply to the test site. Move it around to remove air bubbles. The display locks in when the total depth and number of layers has been determined. Note the reading on the display, which from left to right, shows the number of fat layers detected and the digital reading of total thickness of skin and fat layers. The figures below illustrate various displays.