Monarch International, Inc. Manufactures Ultrasonic Tone Generator. Monarch International, Inc. Is an ISO 9001-2000 certified company. Monarch Ultrasonic Tone Generator is a battery powered continuous tone source of 40 kHz. It allows in "pressurize with noise". This Ultrasonic Tone Generator is capable of 155 dB at 30 cm and can transmit up to 40 feet. These are ideal for enclosed vessels/tanks.
