You calculate the expectable inductance based on known core AL value and number of windings. Or measure it with your LCR meter, presumed it's workiing for the inductance range. Finally you can compare calculated and measured value. Depending on the quality of the LCR meter, you'll decide to believe one or the other...
thanx alot.. i want to know one more thing... what if we know nothing about the core (just out of a junk box) now how can we determine what core it is whether FT37-43 or something else.... assume i don't have an inductance meter to....