... equipment. The downhole tools connected in the drilling-string can measure directional parameters and GR parameters, then send them to the ... , tool face, temperature, GR, resistivity, annular pressure, etc. Technical Specifications Measure range and accuracy Deviation 0~180° ±0.2° Azimuth 0 ... /s Formation resistivity 2~1000Ω·m Continues working time 200h measure while drilling / mwd tool