The most reliable omnidirectional magnetometer that has the ability to be connected with the Edgetech 4200SP SSS. Absolute Accuracy: 0.1nT Sensor Sensitivity: 0.01nT Counter Sensitivity: 0.001nT Resolution: 0.001nT Dead Zone: NONE Heading Error: NONE Range:18,000nT to 120,000nT Sampling Range: 4Hz – 0.1Hz