stadia rod การใช้

• For longer distances, special stadia rods are better suited.
• Since very fine gradations are not necessary for long sights, they may be left off the dedicated stadia rod.
• In order to provide good visibility at long distances, stadia rods are typically wider than levelling rods with larger markings.
• The distance between the instrument and a stadia rod can be determined simply by multiplying the measurement between the stadia hairs ( known as the stadia interval ) by 100.