Designed to work with lead-free paste (Sn96.5/Ag3.0/Cu.5).
Before placing the PCB in the oven cut a piece of the Temperature Marker with a blade or a sharp knife and place it on the surface of the board next to a large component (PLCC or QFP). Make sure you can see the Temperature Marker material through the oven door.
The Temperature Marker material is opaque initially but when 475 °F (246 °C) is reached the material liquifies and becomes shiny, non-reversibly.
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