The orange 3M EMS ball marker phone makes marking and subsequently locating underground telephone lines with 3M Dynatel marker locating devices incredibly easy. It can be detected at a maximum depth of 1.50 meters, is resistant to minerals, chemicals, and temperature fluctuations, making it suitable for any type of soil. The buoyant design in a waterproof PE ball ensures that the marker always aligns itself horizontally, regardless of the installation position. The liquid inside the ball is a mixture of water and propylene glycol, which is biodegradable and harmless to humans, fauna, and flora. The electronic markers are considered the most reliable method for marking existing or newly installed facilities, even under snow. Their function is not affected by metallic channels or pipes, fences, or high-voltage lines.