The Value Series probes provide in-situ measurement of oxygen concentration or carbon potential in atmosphere heat-treating processes. The Carbonseer-Value(tm) and Ultraprobe-Value(tm) ensure optimal furnace performance during heat treatment for improved product quality. The Carbonseer-Value probe is designed with a round slipcast and a platinum-free outer electrode for high carbon atmospheres and furnaces that run a wide range of carbon levels. The SIRO2 substrate of the Ultraprobe-Value is well suited to low- and mid-range carbon atmospheres and is thermal shock resistant. Both probes include a patented Turbulent Flow Tip.