Area Doubling Ruler w/ Cursor Slider
The Area Doubling Ruler is a specialized medical measurement instrument invented by hematologist-oncologist Dr. Colin Paul Spears (and produced by …
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Area Doubling Ruler w/ Cursor Slider
$30 Add to cart -
Volume Doubling Ruler w/ Cursor Slider
$30 Add to cart
Volume Doubling Ruler w/ Cursor Slider
The Volume Doubling Ruler measures objects defined by a circle or sphere for comparison over time and between similarly shaped objects, in Doubling …