The Elrog ER300B glass itself remains the same special glass made in Germany by Schott, now deliver the raw glass tubes to Schmidt Laborglasgeräte where they receive the final shape. This gives a more uniform look from tube to tube. However for those who prefer the traditional hand made look, are still also doing these. With these changes each part of the tubes and each manufacturing step is entirely done in Germany. Each matched pair is supplied with a measurement protocol.