an improved immersible oxygen probe for molten metals has a gas permeable body including an immersion end and a support end adapted for being supported by a lance . an oxygen cell and a thermocouple are supported in the immersion end of the body . an unobstructed gas flow passageway is provided through the gas permeable bodies and through the probe body from the immersion end to the support / connector end whereby gases released from the molten metal and sensor body during immersion readily pass through the probe and can escape from within the probe . thus rapid analysis of the molten metal with improved accuracy within a few seconds after immersion is achieved .