Testlab Inc. 

Hayward Corporate Office

2463 Tripaldi Way

Hayward, CA 94545


PH (408) 988-0101

FX (408) 988-0103


Santa Clara Office

991 George Street

Santa Clara, CA 95954


PH (408) 988-0101

FX (408) 988-0103


To request a proposal or discuss your specific project please contact:


Customer service:



Fresno Office

4284 N. Knoll Drive

Fresno, CA 93722


PH (559) 272-1375



Altadena Office

PH (909) 510-5535


Hayward|Santa Clara- 408-988-0101 | Fresno- 559-272-1375 | Altadena- 909-510-5535


Electromagnetic Pipe Locators

Electromagnetic pipe locators operate by locating either a background signal or by locating a signal introduced into the utility line using a transmitter.  The EM pipe locators consist of a transmitter and a receiver. The transmitter when is direct connected to a conductive pipe or tracing wire emits radio frequency electromagnetic signals chich are traced above ground by a receiver capable of detecting such signals.There are three (3) sources of background signals which can be produced. A utility line acts like a radio antenna, producing electrons which can be picked up with a receiver (Radio frequency). Current carrying conductors have a 60HZ signal associated with them. This signal occurs in all active current power lines regardless of voltage. Utilities in close proximity to power lines or used as grounds may also have a 60HZ signal which can be picked up with a receiver (Electromagnetic).


Sondes are used to locate nonmetal sewer pipes, storm drains and conduits. Sondes also are used to locate cast iron drain pipe. A sonde is a small radio transmitter inserted into a pipe. Once inside, a conventional pipe locator is used to locate the sonde. The pipe's position is then marked on the ground. The sonde is pushed further into the pipe, the receiver relocates the sonde and the pipe's position is again marked. This process is repeated until the desired section of pipe is traced. Another option is to have a plumber snake the pipe. We can attach a transmitter to the snake and trace the line from the signal the snake emits.

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