Testo 0613 1212 saveris immersion penetration ntc temperature probe testo 0613 1212 p this ntc immersion penetration probe from testo is designed for use with products requiring an ntc sensor the probe is designed as a general purpose probe for measurement of temperature in liquids and gels it has a measuring range of 50 to 150 deg c at probe tip and a fixed cable of 1 2m p testo 0613 1212 waterproof temperature sensor 50 to 150 deg