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High input impedance low noise buffer amplifier. Allows the use of oscilloscope probes with 50 ohm spectrum analyzer input DC-400 MHz Bandwidth Input: 1 Megaohm, 4 pF, BNC(f) DC Input resistance can be increased to up to 500 GigaOhms by removing R3, internal 1 MOhm resistor (charge amplifier) Output: 50 Ohms, Type N(f) Gain: 1X into 50 ohms or 2X into 1 MOhm Works by itself or with 10X or 100X scope probes (not included) Solid billet construction, durable black wrinkle powder coat Ultra low noise, virtually no spurious Operates from batteries, 120 VAC, or USB power 6 hour battery life (3 x AAA alkaline) USB cord draws power from the USB port on your oscilloscope (62 mA) Unambiguous ON/OFF power LED indicates "in specification" operation Full specifications show with product images