Testo 510i Bluetooth Differential Pressure Meter Smart Probe (0560 1510) The Testo 510i Bluetooth Differential Pressure Meter Smart Probe is designed for quick, precise measurement of gas flow pressure, static pressure, and pressure drops across filters and coils. Paired with a smartphone or tablet via the free Testo Smart App, the compact 510i turns the device into a powerful measuring instrument for HVAC professionals. It measures differential pressure across a range of -150 to +150 hPa (-60 to +60 inH₂O), with resolution down to 0.01 hPa. A measurement rate of 2 readings per second gives real-time, ongoing data, useful for assessing system behaviour across different phases of operation. The unit is lightweight and portable, with a magnetic attachment for hands-free operation and a rated 150-hour battery life. It's recognised at the 2016