- During testing, function switchover button can be pressed for switchover of dual-tone - Finding function: for telephone, network and electric wires - Collation function - Open or short circuits testing functions - DC level testing function - Telephone line signal detect - Low-voltage alarm function - Earphone function - Spotlight function - Telecom post bureaus/net bars/telecom engineering companies/network engineering companies/ power supplies/army and other departments requiring wire Specifications: - Power supply: 9V DC battery (Not included) - Signal transmission format: multiple frequency impulse - Distance of signal transmission: >3km
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