Testo 0628 7503 temperature probe with aluminium sleeve ntc testo 0628 7503 this ntc probe with aluminium sleeve is suitable for temperature measurements in liquids and pastes as well as air due to its ntc sensor element the probe provides precise temperature measurements with an accuracy of up to plusmn 0 2 deg c the temperature probe features a 2 4m cable and is suitable for use with any testo product with an ntc sensor input testo 0628 7503 temperature probe with aluminium sleeve nt