A new and distinct cultivar of Verbena plant named \u2018Balazcoral\u2019 characterized by its light salmon-colored flowers, medium green-colored foliage, good basal branching, and moderately vigorous, semi-trailing growth habit. The support frame includes a first support arm, a linking rod, a poke rod, an elastic member, and a second support arm. 3 to 16, 18, 20 to 33, 35 or 37 to 39. Each conveying arm may be raised or lowered by a cylinder. During a calibration operation, the shutting means 40 is closed, and the correction means 30 determines a correction coefficient for correcting fluctuations in the amount of infrared radiation from the optical system 20 by using the output of the infrared detector 10 imaging the shutting means 40.