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A common complaint amongst signal integrity engineers is that every high speed instrument in their laboratory gives them a different answer when they measure jitter. This paper looks at some generic instrument types (‘real time’ scope or ‘DSO,’ ‘equivalent-time’ or sampling scope, and BERT or BERTScope) and examines why answers can be different. The intent is not to identify one type as universally correct — unfortunately such an instrument does not exist for all situations. It does, however, aim to give guidance on certain conditions where some methods do better than others. This paper is based on an eSeminar given with EDN Magazine, February 2009.