Description:  Detecting cables,electrical lines,water/gas supply pipelines buried in wall or earth.  Detecting interruptions and short circuit in cables and electrical lines buried in wall or earth.  Detecting fuses and assigning current circuits.  Detecting interruptions and short-circults in floor heating.  Detecting sockets and distribution sockets having accidentally been covered by plastering.     Features:  The transmitter is integrated with the function of AC/DC voltmeter, which can measure 12 to 400V AC/DC voltage on a linear basis.  The screen of the transmitter can display preset transmitting power,transmitted codes, its own battery energy, mains voltage detected, AC/DC status of mains voltage detected, and warning symbol for mains voltage.  The Transmitter has the function of self-inspection to detect its own working status and to display it on the LCD screen for user's reference The sensitivity of the receiver can be adjusted either manually or automatically.  The receiver can sweep frequency automatically, both the transmitter and the receiver can work under mute mode.  Additional transmitters are available for expansion or to differentiate between multiple signals compactness, durability and portability.     Specification:  Voltage Measurement Range: Transmitter: 12V-400V (AC / DC).  Output Signal : Transmitter: 125KHz.  Voltage : Transmitter: maximum 400V (AC / DC).  Cable Depth Measurement: Receiver 0-2.5 m (wall / underground cable).  Main Voltage Measurement: Receiver 0-0.4m.  Work Environment: Transmitter: 0~40 °c; Receiver : 0~40°c.  Storage Temperature: Transimiter: -20°c~60°c; Receiver : -20°c~60°c.  Relative hamidity(no condensation): Transmitter Maximum: 80%; Receiver Maximum: 80%.  Measuring Height : Transmitter Maximum: 2000m; Receiver Maximum: 2000m.  Battery: 6 x 1.5v AAA Battery (NOT included) 1 x 9V Battery (NOT included).     NOTE:  Product model NO. upgraded from MS6818 TO MS6818S, function not changed.     Package included:  1 x MS6818 Receiver.  1 x Transmitter.  1 x Test Leads(Black & Red).  1 x Test Probe(Black & Red).  1 x Crocodile Clamps(Black & Red).  1 x Grounding Rod.  1 x User Manual