from 2012-02-01 and to 2014-02-01

when the magnetic field from an iron object underground is stronger at sensor A than sensor B

2- case function

dammskyddad

This unique reflector has two prisms facing each other

pegelskala vattenstandsmatare 1m 3 from 2012-02-01 and to 2014-02-01Level scale water level gauge 1m Function The mirror consists of a fixed scale to read the height of the water surface. Performance black centimeter graduation and height number in decimeters on white background number 0 is marked in red There are pre drilled holes (7 mm) along the level scale. Material and surface coating enameled aluminum The enamel coating effectively prevents the effects of air and water pollution as well as UV radiation. Measure