The purpose of this standard is to establish the specifications of a series of burettes without a defined waiting time (type I burettes) and suitable for the general needs of laboratories. These burettes must comply with class A or class B precision. The specifications included in this standard are in accordance with standards UNE 43-301 and UNE 43-304/1. NOTE- The general specifications for burettes are indicated in the UNE 43-304/1 standard. The particular specifications for burettes with a waiting time of 30 s are given in the UNE 43-304/3 standard.