Biocolor gauge glass can be used to indicate the drum level to a person on the operating floor by?

Biocolor gauge glass can be used to indicate the drum level to a person on the operating floor by?

Biocolor gauge glass can be used to indicate the drum level to a person on the operating floor by?




A. Ultrasonic level gauges
B. Differential pressure level meters
C. Electrical capacitance level gauges
D. Hooded mirror
E. Gauge glass




Answer: D


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