Digital Handheld Differential Pressure Gauge Negative Pressure Tester 1. Measuring range: - SW-512A: +-3.45KPa - SW-512B: +-39.99KРa - SW-512C: +-103.42KPa 2. Accuracy: - SW-512A: +-1%FS, maximum error 35Pa - SW-512B: +-1%FS, maximum error 400Pa - SW-512C: +-1%FS, maximum error 1.04KPa 3. Limiting maximum pressure: - SW-512A: 6.89KPa - SW-512B: 79.9KPa - SW-512C: 206.7KРa 4. Repeatability: +-0.25%FS 5. Response time: 0.5S 6. Pressure connection: one 18 inch (3.18mm) quick connector 7. Working temperature and humidity: 0 - 40 degrees Celsius 10% - 80% RH 8. Storage temperature and humidity: -10 - 60 degrees Celsius 10% - 90%RH 9. Over-range prompt: Err1 or Err2 10. Power supply: 3 x 1.5V AAA (not included) 11. Size: about 13.85 x 6.35 x 2.7cm 12. Weight: about 120g Features: 1. Switch between multiple pressure units, directly output data without further calculation 2. Positive and negative pressure sensors 3. Recording mode, can record pressure values ??within a period of time and generate maximumminimumaverage values 4. Large screen backlight, easy to measure in dark environment 5. High-precision mold cast in one time, high-strength ABS engineering plastic better protects the fuselage Packing list: - Differential pressure gauge x 1 - Instruction manual x 1 - Adapter x 2 - Silicone tube x 2 - PVC tube x 2 - Carrying bag x 1