These are crayons, tablets, or paints that indicate a temperature by melting at specific the specific temperature indicated on the crayon. Templestick is one brand name and had been around a long time. You can get a very good Safety Relief Valves indication of temperature with them. You buy the sticks, looks like a chalk marker, at or near the temperature you are want to achieve or maintain. Say you want to get a preheat of 400°F you have a Balance Valves Templestick that would indicate this temperature. As you heat the part you continue to mark the part with the stick and when it melts, very noticeable, you have achieved your Instrumentation Ball Valvesdesired temperature. Normally one would have 1 or 2 sticks on the approach and one over. They are available in very wide range ofNeedle & Gauge Valves temperatures and available at welding supply houses or scientific supply houses. In welding they are often used to indicate preheat and monitor inter pass temperature. Some times a Instrument Manifolds procedure will call-out the location needed for the temperature indication, 4" from the center of the weld is quite common. All welders on site had a sticks for our required preheats and were required to use them. We used them for a lot of other temperature measurements around the plant.

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