A balance
The 17-letter word for an instrument used to find mass is "microbalance." A microbalance is a highly sensitive device used to measure the mass of very small objects with high precision. It is commonly used in scientific research and analytical chemistry for accurate weight measurements.
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Floe! It took us a while to find this word too!
mass
The word you are looking for is "mass."
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Latin
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Mass
tonne
void
kilo