Features: 12 Selectable units of measurement Pressure Difference Measurement MAX / MIN / AVG Data mode Data HOLD function Large LCD with backlight Data storage function with a time stamp Zero function Low battery alarm Automatic power off function Over range indicator: HI / LO USB for power supply Specifications: Pressure Range: ±2.000 Psi Measurement unit: Pa, psi, kgfcm², bar, inH₂O, ftH₂O, inHg, mmHg, ozin², mbar, cmH₂O and kPa Accuracy: ±.3% (@25°C) Repeatability: ±.2% (Max±0.5%) Linearity / Hysteresis: ±0.29% Data Storage: 99 groups Response time: 0.5s Out of range indicator: Hi or Lo Automatic Power off conditions: No operation for 10mins Operation condition: 0~50°C (32~122°F) Storage condition: -10~60°C (14~140°F) (The product printed words depending on the batch, but this does not affect use) Color: As Shown Material: ABS Package Contents: 1 x Manometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.