How to Read a Physician's Balance Beam Scale

Most patients who have been to a doctor's office have had their weight recorded using a balance beam scale. These scales differ from the typical flat scales in many homes that simply display a weight readout with no further action. Instead, these scales must be properly balanced using a system of weights at the top of the scale's neck to determine the weight of a patient or object. Although it may seem complicated, obtaining an accurate measurement from a balance beam scale is as simple as moving the appropriate weights at the top of the scale until the balance mechanism stays level and steady.

Instructions

• 1

  Stand on the scale's platform with feet flat and weight evenly distributed. Do not rock, sway or put more weight on one foot than the other. This can cause inaccurate readings.

• 2

  Move the bottom weight up to around the 100-pound marking. This larger weight measures in increments from 50 pounds to 100 pounds, depending on the scale. It is helpful to know an approximate weight before stepping on the scale to determine this initial setting. For example, if you have averaged around 110 pounds in the past, go ahead and set the weight to 100 pounds. If you have averaged over 200, however, move the weight over to the 200-pound marking.

• 3

  Adjust the smaller weight on the top beam. This weight measures in increments as low as one pound and can be used to fine-tune the measurement. Move the weight until the protruding metal tab on the right side of the scale begins to balance itself.

• 4

  Nudge the smaller weight on top to the left or right until the metal tab on the right is in balance. The scale is in balance when the metal tab is completely level.

• 5

  Read the weight on the scale. Note the weight setting on the lower, heavier weight. Then, add that amount to the weight setting on the higher, lighter weight. For example, if the scale is balanced with the lower weight at the 100-pound marker and the higher weight at the 74-pound mark, the total weight would be 174 pounds.