If you do some lab work this book is what you need to grasp the meaning of all the experimental practices you will use. You will get answers to questions such as why you always need to repeat your measurement. The purpose of laboratory report. And many more. Don't think buy it, this book got me through my engineering undergraduate, I have kept it and I keep using it.
Experimental Methods by Les Kirkup is a must for anyone studying the physical sciences. The author goes into great detail about correct experimental practise and data analysis.
Perhaps the most useful feature of this book is its extended cover on error analysis, using plenty of easy to understand worked examples. It does well to explain the concepts of error analysis in a physical sciences based context rather than a statistics based context which is where a lot of other texts fall down.
The author also details what is expected in a standard laboratory notebook, using excripts from his own log book and examples of relevant information that should be included.
So all in all a fantastic book for anyone doing an undergraduate course in science or engineering.