Altop industries offers a wide range of temperature calibration products. These are developed to meet modern industry requirements. As part of these products, the company offers temperature calibration furnace atcal 3000. It is equipped with high alumina tube wool with a heating element from outside. A pid controller is provided to control the instrument. There is a provision of increasing the stability by inducting a insert in the tube. These furnaces have a stability of ±0.5ºc, uniformity of ±1ºc, resolution of 1ºc and accuracy of ±0.5% of fsd. These are offered in three different models.