The Fieldpiece LT16A is a classic‑style true RMS digital multimeter designed for HVAC/R and motor testing; it measures voltage, current, resistance, capacitance, frequency, continuity, temperature, and phase rotation with detachable test leads that can connect to accessory heads. Common failure points in this class of meters include dead or degraded batteries, faulty display backlight, worn‑out test lead contacts, and internal circuit board damage from overvoltage or moisture ingress. First‑check diagnostics should verify the 9V/AA battery condition and replace if below 50 % capacity; inspect all test leads for corrosion or breakage and confirm proper contact with the meter’s terminals; then power on the unit and review any error codes or stuck “0” readings that may indicate internal fault.[oss-gpt-20b]