... . MWD obtains real-time measurements downhole, such as gamma rays, temperature, soil resistivity, pressure, drill angle, etc., and transmits them ... : ±1.0°Max Operating Temperature: 150°C Max Pressure: 100MPaPressure barrel outer diameter: Φ48mm Natural Gamma: Sensor: Scintillating crystal + Photomultiplier tube ... system: 6.8m (without Gamma)/8.8m (with Gamma) High Quality Wireless directional finder