This thermocouple is compatible with larger and the digital Jen-Ken kiln models, but before ordering, look at your probe and make sure it looks the same.
This unit lasts for years and usually fails from deterioation inside and between the insulators. It senses the inside temperature and sends the signal to the controller. The tip and the tail may look good, but inside the ceramic insulators it may be flaking and disintegrating.
Oval block is sold separately and does not usually need replacing as often as the probe. Clean the connection holes and the thermocouple ends with fine sand paperor a wire brush to make sure there is a clean connection.