This Testo bluetooth vacuum gauge has a resolution of 1 micron. The vacuum gauge contains Pirani sensors which will give you single digit resolutions while providing real time data and calculations for the saturation temperature of water. This means that the Testo uses this real time data and can determine the proper micron/temperature for which optimum levels of moisture are removed from the system. These internal calculations will notify you when the pressure is at the correct level to meet your target evacuation point. This factor is important due to it saving time and allowing peace of mind that there is no moisture or contaminants in the system. This vacuum gauge unit features Bluetooth and an alarm for when your target values have been reached by the vacuum.