Check the listing for details. TRIPLETT EMF20 Magnetic Field Meter,Single Axis Sensor 61KM65. Condition: New. Listed at 125.85 USD. Magnetic Field Meter, Accuracy +/-(2.5 Percent +/-6 digits), Frequency Measurement - Maximum 300 Hz, Frequency Measurement - Minimum 30 Hz, Number of Digits 4, Testing Functions Low Frequency Electromagnetic Fields, Features 1 Year Warranty, Max Value Hold, Measurements Displayed in Milligauss or ΜTesla, Single Axis Sensor, Alert Type Digital Display, Electric Inductance Measurement - Maximum Not Applicable, Electric Inductance Measurement - Minimum Not Applicable.