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Bard part 8603-029 is a pocket thermometer with a 1/8 inch probe and a 0 to 220F range, commonly used by technicians to verify air temperature rise, supply and return temperatures, and general troubleshooting readings while servicing Bard wall mount and packaged HVAC equipment. Keeping an accurate thermometer in your service kit helps confirm system operation during startup, maintenance, and diagnostics, especially when checking coil performance and airflow-related issues. As a genuine Bard OEM service tool item, 8603-029 is selected to support proper field checks so you can document temperatures consistently and make confident adjustment or repair decisions.