One differentiates between insulated and non-insulated measuring points. In the case of insulated measuring points, the measuring point is not connected to the outer sheath (ungrounded measuring points), while in the case of non-insulated measuring points it is welded to the outer sheath (grounded measuring points). Insulated measuring points make the sensor somewhat more slow-acting thermally, but also less sensitive to interference during signal transmission. Sheathed thermocouples with grounded measuring points have a very fast response time, but are much more sensitive in terms of signal transmission.