Standard test temperature: 20 °C, humidity: 70%. If test results show no variation, testing under normal ambient temperature and humidity is acceptable. Current sensitivity: Pointer scale range is from zero to full scale; sensitivity is 960 µA ± 8%. Internal impedance: 650 Ω ± 10%. Insulation resistance: ≥ 50 MΩ at 500 V DC between case and circuit. Zero position: The pointer tip aligns with the center of the zero mark; tolerance: ±1 mm. Balance: When tilted ±90° from default vertical position, allowable pointer deviation is ±1 mm. Overload response: With instantaneous triple full-scale current, pointer returns to approximately one-third of full scale as current decreases. Friction error: As current is gradually increased or decreased, indication error is within ±1 mm. Pointer swing direction: Left to right. Needle length: 44 mm ± 1 mm (from pivot center to tip). Needle width: 0.45 mm ± 0.05 mm. Mounting orientation: Vertical. Operating temperature range: –10 °C to +60 °C, relative humidity 35–85%. Storage temperature range: –20 °C to +60 °C, relative humidity 35–85%. Avoid direct sunlight exposure. Store in original packaging to prevent contamination. Soldering conditions: Terminals immersed in molten solder (230 °C) for 3.5 seconds — device remains functional. Soldering iron temperature: 350 °C; contact time: 3.5 seconds; contact point: ~3 mm from terminal end — device remains functional. ESD test: Surface rubbed with dry nylon cloth — no adverse effect observed.