refractometer
Concise Oxford English Dictionary © 2008 Oxford University Press:
refractometer /ˌriːfrakˈtɒmɪtə/
▶noun an instrument for measuring a refractive index.
– derivatives
refractometric adjective,
refractometry noun.
refractometric adjective,
refractometry noun.
'refractometer' also found in these Oxford entries:

