The term "high specification" refers to a set of standards or requirements that are particularly demanding, strict or rigorous. It implies that something has been designed, built or created with very high quality and precision, using advanced technology, materials or techniques. In other words, it means having exceptionally high performance, accuracy, reliability, durability or efficiency. The phrase is often used to describe products, systems or services that are of superior quality and meet the most stringent requirements in their respective fields.