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stonylab ensures top quality, supported by annual verification and certification via GDMS testing from an accredited third-party laboratory Ultra-Pure Graphite: 99.99% carbon with PTFE coating, copper core, and leak-proof rubber seal 30x30x3 mm Electrode: Stable at RT-60°C, permanently welded construction Multi-Role Electrode: Anode/Cathode/Auxiliary use, fully integrates with Stonylab systems Contact us immediately for damaged products or custom size inquiries