9 Electrical Test Instruments, Testing Instruments for Use in Cable Test Vans-Namely, High Voltage Generating, Measuring and Testing Instruments for Cables and Cable Installation, Phase Angle Measuring Instruments, Differential Locator Coils, Electrical Disconnecting Filters, Cable Burn Down Instruments, Condenser Batteries, Spark Gaps Used in Testing Instruments, Audio Frequency Generators, Transmitters and Receivers for Cable Location, Pressure Meters with Transducers, Electrical Measurement and Recording Instruments for Flow and Pressure Measurements, Mains Switching Panels for Switching Over Single Test Ranges and for Simultaneous Registration of All Measurement Technical Data, Wheeled and Portable Measurement Instruments for Precise Determination of a Damage to Channels According to the Body Sound and Geophone Principle, Cable Fault Pre-Location Instruments, Gas Leak Detectors, Pipe Locators, Water Leak Detection Instruments, Slide Valve Locators, Insulation Testers