"SOLID STATE; BATTERY OPERATED; OUTPUT METER W/ZERO ADJUSTMENT AND GLASSCOVER; TWO PROBES C/O MICROPHONE & A PREAMPLIFIER AND SHIELDED AGAINST RF INTERFERENCE,ONE PROBE CONTAINS A STAINLESS STEEL STYLUS 5.000 IN. L; POWER SWITCH; HEADPHONE W/IMPEDANCE OF 600 PORM 50 OHMS; CONTROL KNOB; SIGNAL-TO-NOISE RATIO 45.0 DB"