Standard tube furnaces where the heating elements are wound onto the ceramic tubes does not facilitate interchangeable tubes. By application of Kanthal HAS series heating modules we now produce a series of Modular Furnaces where operator can easily change the work tube whenever necessary. These furnaces can also be modified as 3-zone furnaces to achieve a wider stable heated zone, although the standard range is of single zone. Almost all of our controller range can be applied as well as Master & Slave programmable combinations.