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Description:it make up of box and needle,appliance of estimating distance, mileage framework, pitching framework and coordinate ruler,can direct direction,measure distance, the angle of pitching,coordinate and draw map. setup of measurement azimuth:is make up of box and needle, azimuth casing,appliance and windows of present. implement of estimating distance:is make up of appliance and window of present and other asure precision is 5%. framework of measure pitching :is make up of pitching implement of present,swing of present and other thing.bound of measure is ±90°,unit is 5°.presion is 2.5°. framework of measure mileage:is make up of wheel of mileage,needle of watch and system of gear and other thing.unit:kilometer,preision is 2%. coordinate ruler:is make up of two ruler which is upright with each other. the lengther:80mm,the shorter:20 mm,unit:1mm precision:0.5mm product dimension: 80x60x27mm inner compass diameter:50mm outer compass diameter:48mm neckstrap length:515mm box dimension:93x70x35mm n.w:115g g.w:210g