I have used the same scale for a couple years. New batteries and all. My vine maple bow pulls 54 in the summer. In the January cold, it pulls 66 lbs. FROM MY 2018-2019 NOTES: "August 13, temp 72 f. 54 lbs. @ 28. Humidity 56%. January 11, 2019 temp. -18f. 66 lbs. @ 28. Humidity 18% . ". Bow has no backing. Hits like a hammer though! Worry not.
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Go forth. Produce food. Loose and lose arrows. enjoy nature all year around.