The EMF-839 from Lutron Electronic Enterprise is a 3-axis Electromagnetic Field Meter with a frequency range from 100 KHz to 3 GHz. This 50-ohm meter has 2 probes with an accuracy of ±2 dB and includes a peak hold and data hold function to latch the peak value and lock the current reading. It has an alarm and buzzer setting to warn the user about antenna proximity. This EMF meter has a real-time data logger and, a built-in clock and supports auto or manual data record with 16,000 data logger numbers. It includes a large LCD screen with contrast adjustment and supports an RS232 PC serial interface for data output. It requires a DC power supply of 9 V and has a power current rating of 5.95 mA.

The main instrument of EMF-839 measures 200.0 x 76.2 x 36.8 mm and the probe measures 70 (Dia.) x 290 (L) mm. It is designed for measuring and monitoring electromagnetic fields and can be used in cell-phone stations, hospital equipment, radar, microwave ovens, radiation work, TV antenna, Radio stations, welding equipment, baking equipment, television, computers, factories, laboratories, and other environment.