General purpose hydrometers.
They can be used as general purpose hydrometers ( M100 - S50) , or high precision hydrometers ( M50 L50 - L20) .
They are calibrated using our official master hydrometers at 20 ° C according to the following superficial tensions:
from 0.600 to 1.000 g/ ml= between 16 and 35 mN/ m LOW TENSION
from 1.000 to 1.300 g/ ml= 55 mN/ m MEDIUM TENSION
from 1.300 to 2.000 g/ ml= 75 mN/ m HIGH TENSION.
Reading below meniscus. An indelible reference mark is engraved on the stem , enabling the user to notice any movement of the scale
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