Pyrometric cones are small, specially formulated ceramic indicators used to measure heatwork inside a kiln — the combined effect of temperature and time. Unlike a digital thermometer that only shows temperature at a specific moment, cones bend at a predictable rate when the correct amount of heat has been absorbed, giving you an accurate visual confirmation that your firing reached maturity.

Available in a wide range of cone numbers (from low-fire 022 up through high-fire 10+), pyrometric cones help ensure glazes develop properly, clay bodies vitrify correctly, and results remain consistent from one firing to the next. Whether you’re firing Cone 06 bisque or Cone 6 glaze, cones placed inside the kiln are the most reliable tools for verifying performance and protecting your work.

Small Cones come in a box of 50.