The Testo 552 is a highly precise digital vacuum gauge that monitors HVAC and heat pump system evacuation, taking deep vacuum measurements to identify any potential issues in heating and air conditioning system efficiency. The Testo 552 is a highly complex tool, utilizing Bluetooth and a proprietary application to provide results directly to electronic devices. While this is a resilient tool, Testo 552 calibration is a critical part of maintaining precise and reliable measurements. Our highly experienced calibration technicians take measurements that are then compared to a standard. Any irregularities or inaccuracies are thoroughly documented before the device is returned to its intended tolerance. Our calibration experts provide clients with detailed reporting that includes measurements before and after calibration, any adjustments or repairs made, and a calibration certificate. All ATS calibration reports are readily available to our clients electronically through our iPortal interface.