The value obtained can only be an approximate range ~
Because you don't know its actual melting point when you set it, you can only set a slightly higher temperature, and then the instrument will gradually heat up under the control of programmed heating, and there is no feedback mechanism, so it doesn't matter whether your sample melts or not; If the temperature you set is much higher than your melting point, all the samples may become liquid at once, and I don't know where the temperature soared at first sight ~
Secondly, the melting process is not very beautiful. The number, compactness or looseness of your samples have a great influence on your observation, so the repeatability may not be very good ~
I hope I can help you ~