... optional tunable square wavePulse Energy: Low (100 V), medium (200 V), high (300 V), and max (400 V)Damping: 50 Ω, 63 Ω, 150 Ω, and 400 ... unrectified RF settingsAnalog Bandwidth: 0.3 MHz to 20 MHz at –3 dBTest Modes: Pulse echo, dual, or thru-transmissionAlarms: ... Hz to 60 HzBattery: Internal rechargeable NiMH battery pack rated at 6 V at 3200 mAhBattery Operating Time: 5 to 6 hours nominal ...