The 6040 Selective Level Meter weighing only 21 pounds, including batteries is one of the most field usable units on the market! It covers the frequency range of 300Hz to 3.5MHz with level measuring range from -100 dBm to +21 dBm. Specifications allow for a multitude of applications?up to 1Hz resolution and accuracy to 0.4 ppm and level measurement accuracy at ?0.2 dBm. Bridging or terminated measurements may be made on balance or unbalanced 50, 75, 124, 135, 150, or 600-ohm circuits. Other features include bandwidth filters of 50, 100, and 3.1 kHz, AFC circuitry and an analog level meter (4 dB and 21 dB ranges) for peaking and base band scanning.