C.Scope, DXL4CAT-DBG/SGV4, DXL4 Digital Cable Avoidance Tool with 33kHz and 131kHz Tracing Frequency, Depth Measurement, USB, Bluetooth™, Data Logger and GPS, SGV4 Generator and Professional Carry Bag
Do not require periodic recalibration.
A fully Automatic Daily Self Test (ADST) tests and confirms that they are functioning at their optimum level each day.