
5. Place the Light Wand on the center of biceps of dominant arm (the arm you write with).
Press firmly; use enough force to leave a slight ring on the arm when the Light Wand is
removed.
NOTE: It is important to:
1. Aim the silver stripe on the Light Wand directly toward the shoulder.
2. Keep the arm relaxed (do not permit the subject to flex his/her muscles). A
relaxed biceps can be achieved by having the subject seated while resting his
arm (elbow bent) on a table. The hand should be open with the palm facing up.
3. Use the Light Shield to block the external light. Avoid measurements under
strong lights (e.g. direct sunlight).
6. Press the Measurement Button on the Light Wand. The display will flash "Reading..."
during the optical measurement. When the measurement has been completed, the display
will read "Remove & Replace".
7. When "Remove & Replace" is displayed, remove the Light Wand and then replace it on
the same point on the biceps for a second measurement.
8. Press the Measurement Button. The display will again flash "Reading..."
9. Percent body fat will then be printed and displayed.
10. Press CLEAR to perform another measurement
11. When finished, turn power switch to OFF.
CAUTION: Do not move the Light Wand while the word "Reading" is displayed.
Locating the Biceps Measuring Site -- The estimation must always be performed at the same
site on the arm -- the midpoint of the biceps.
1. Unfold the Biceps Locator into a straight ruler. Place the edge of the Biceps Locator
labeled TO UNDERARM at the lower edge of the crease of the underarm (i.e. the
anterior axillary crease of the dominant arm).
2. Measure the length of the arm between the underarm crease and the center of the elbow
crease (i.e. the acromion), using the scale printed on the Biceps Locator.
3. Locate this same number on the ruler starting from the UNDERARM end. This estimate
represents half way between the armpit and the elbow (i.e. "belly" of the biceps muscle).
More technically stated: Measure along the anterior line of the biceps halfway between
the antecubital fossa and the acromion.
4. Using a highlighter, place a line on the side of the arm adjacent to the Biceps Locator.
This is the site where FUTREX-6100/XL measurements should always be made.
Figure 4 – Biceps Locator