The Walker Scientific ATS‑6044T is a portable alloy thermo‑sorter that uses the Seebeck effect to classify metal alloys via hot and cold probes; it operates on 120 V AC or battery for up to eight hours and displays results on an integrated digital panel. Common failure modes reported in field service include probe tip corrosion or detachment, thermocouple junction degradation, power supply voltage sag, and display backlight failure. First‑check diagnostics: verify input voltage and continuity of the power supply rails; inspect the hot/cold probes for physical damage or loose connections; review any error codes shown on the panel (e.g., “TEP‑FAIL” or “PROBE‑DISCONNECT”) and confirm that the thermocouple junctions are properly seated.[oss-gpt-20b]