The line level is a relatively cheap, quick and accurate tool in marking contour lines. It consists of a miniature spirit level that hangs from a taut string between two poles
Line level ndiyotsika mtengo, yachangu komanso yolondola popanga akalodzera. Ili ndi spirit level yaying'ono kwambiri yomwe imakolekedwa pa chingwe chokungika kwambiri pakati pa dondo ziwiri