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Our Angle Finder Locator is for civil engineering (solar photovoltaic professional installation of retaining wall construction, ditches and dams, pipeline drainage, etc.). Building engineering, indoor and outdoor drainage gradient setting, inclination measurement.Our angle locator is designed for durability and convenient use.This angle meter protractor is high-visibility indictor with clear marks and large digit, easy to read.Features:Made of high-impact ABS plastic, durable, lightweight and resistant to wear.A High sensitivity bearing gravity dial is used to automatically measure various gradients.With a high transparency panel, the observation is clearer. The conversion tables of slope and angle are attached.Specifications:Determination range: 130°-0°-130°; 50° 90°-0°-50° -90°; 1branch~8branch(0.5 Graduated scale); 12%?15%?18%?20%Accuracy: ±1°Outline size: 3.74x3.74x1.2inch / 9.5x9.5x3cmWeight: 0.26lb / 118g