The Druck DPI610 is a handheld pneumatic/hydraulic pressure calibrator that generates and measures pressures up to 20 bar (±850 mbar) with fine adjustment via a volume adjuster and release valve; it also supports 4‑20 mA loop testing and data logging. Common failure modes for this class of instruments include battery depletion or low voltage, pump wear leading to pressure drift or loss of range, faulty pressure transducer causing display inaccuracies, and internal connector corrosion affecting signal lines. First‑check diagnostics: verify the battery voltage and replace if below spec; inspect the pump motor and check for smooth operation under load; review any error codes on the display and confirm all external connections are secure and free from leakage or contamination.[oss-gpt-20b]