Voltage and heating performance The heating current increases with input voltage, providing stronger heating for the same item. Higher voltage also means more heat, so choose the input voltage based on actual needs. For general use, a 24V or 36V power supply is usually sufficient. Power level and applications With moderate power, this unit is suitable for small parts in DIY projects. It supports hardening, annealing, and other heat treatments for small components. Graphite crucible compatibility and melting Can be used with a graphite crucible to melt gold, silver, copper, aluminum and other metals. Provides uniform heating and fast melting, making the process convenient. Use scenarios Scenario 1: DIY small parts heat treatment such as hardening and annealing of small metal components in hobby projects. Scenario 2: Jewelry making or metalworking where controlled, uniform heating improves results. Scenario 3: Melting and alloying metals with a graphite crucible (gold, silver, copper, aluminum and other metals) for casting or shaping with even heat distribution.