PNG Drawing of a balancing tool, transparent background https://www.rawpixel.com/image/572324/png-drawing-balancing-tool-transparent-backgroundView license
Balancing tool illustration vector https://www.rawpixel.com/image/573509/density-scientific-equipmentView license
Drawing of a balancing tool https://www.rawpixel.com/image/571476/density-scientific-equipmentView license
Density tool from Six weeks of vacation (1880) published by Paul Poiré. Original from the British Library. Digitally… https://www.rawpixel.com/image/571620/density-scientific-equipmentFree Image from public domain license