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Description: Manual zeroing and difference measurement operations: 1, zero, press the DIF button, the screen displays "DIFFERENTIAL PRESSURE", while long press the HOLD button (press first) and the backlight button (post press) does not release, after 3 seconds the screen displays "0", the surface has been zero Finished, this is to release the HOLD button and the backlight button to return to the normal measurement mode with a degree of zero. 2.If the difference is required, press the DIF button during the measurement. The displayed reading will be the difference between the currently measured pressure value and the pressure reading of the pressed DIF and display “DIFFERENTIAL PRESSURE”. Specification: Model: GM510 color: gray Measuring range: ±10kPa Accuracy: ±0.3% FSO (25°) Repeatability: ±0.2% (maximum ±0.5% FSO) Linearity / Hysteresis: FSO ± 0.29% Maximum pressure: 50kPa Response time: 0.5 seconds Temperature compensation function: No Positive overload alarm: error 1 Negative overload alarm: error 2 Working temperature: 0-50° Storage temperature: -10~60° Battery: 4 * 1.5V AAA battery (not included) Size: approx. 165 * 76 * 38 mm / 6.5 * 3 * 1.5 inches Weight: about 400 g / 14.1 ounces Package list: 1 * digital pressure gauge 2 *Translucent silicone hose 2 * Transparent PVC hose 1 * USB cable 1 * CD software Note: When you are not using a pressure gauge, please remove the battery to prevent leakage and damage the pressure gauge.