LEAN-MEATER ®
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LEAN-MEATER ® - 1

INSTRUCTIONS FOR USE The Renco Lean-Meater uses pulsed ultrasound to measure total backfat depth of mammals having 1, 2, or 3 backfat layers. Total measurement range and accuracy including skin is 435mm, ±1 digit. Power is provided by a Nickel Metal Hydride (NMH) rechargeable battery. The number of backfat layers is automatically determined and displayed. The instrument is not waterproof, do not submerge. To assemble, connect the probe to the cable and the cable to the instrument. Twist both connector barrels until they snap into locked position. Turn On Sequence Press and hold the push button to turn on the instrument. The display will show the number “88” for a second, verifying that all segments are functional. The 3 READ lights on the left side of the display will turn on briefly. After a moment, the right-most digit will show “0” and the rest of the display will be dark. READ LIGHTS: 1 LAYER 2 LAYERS LIGHTS WHEN BATTERY CHARGER IS PROPERLY CONNECTED DISPLAY EXAMPLE SHOWS 2 LAYERS & 12mm OF BACKFAT INCLUDING SKIN Using the Lean-Meater Apply a generous amount of coupling fluid, such as cooking oil or water to the test site. Insufficient coupling fluid is the most common source of error as ultrasound cannot pass through air or air bubbles. Press the Power button. Apply the probe to the site, use a gentle pressing/rotating action to force out any air bubbles between the skin and probe. It is important that the probe be kept perpendicular to the back. Errors may result if probe is at an angle. Many have found that the probe is most easily managed if held between the index and middle fingers. The illustration above shows 3 READ light indicators on the left. The TOP light indicates 1 layer, TOP and MIDDLE lights, 2 Layers, all 3 lights, 3 Layers. (The illustration shows 2 layers.) The skin thickness is included in all cases unless it is >3mm, in which case it will be counted as 1 layer. The skin of most mammals does not exceed 3mm. The READ indicators light when the appropriate number of layers have been found. If Read light(s) do not come on, then skin contact is poor; use more oil, make a greater effort to remove air bubbles, be sure probe is perpendicular to the back. Consistency of probe placement is of great importance in obtaining comparative measurements. ©2019 Renco Corporation. All rights reserved. LM-14A Inst Man 01/19

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LEAN-MEATER ® - 2

For swine, only site B (see the drawing below), will give an accurate reading of the 3 layers of fat. Many hogs have a third layer of fat. As they increase in weight and age, the third layer becomes thicker and more widespread over the body. Site B is the location normally used in the old metal ruler probing technique, and shows the best correlation with overall carcass yield. Because of the trapezius muscle at the shoulder (false lean), measurement at site C is more difficult and inconsistent. (True for both ruler and ultrasound devices). Site A will give accurate measurement for two...

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LEAN-MEATER ® - 3

battery for extended periods of time, say over 30 hours, as it may actually shorten the battery life.) The instrument is deactivated and not usable when the charger is connected. When the battery becomes discharged and no measurement is being made, a horizontal bar will show in place of the “0”, which indicates only a brief time remains. The “0” reappears when a measurement is made. Nickel Metal Hydride Battery (NiMH or NMH): Battery is “green” and does not need to be recycled. The Renco NMH battery uses special cells and should only be replaced with Renco replacements to avoid damage and...

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