What type of gauges should not be used for oil tanks due to the risk of breakage?

Glass gauges are not suitable for use on oil tanks primarily due to the inherent fragility of glass. When subjected to environmental stressors, physical impact, or even normal handling, glass gauges can easily break. This poses significant risks, as a broken glass gauge can lead to spills, leaks, or exposure to hazardous materials contained in the oil tank, creating both safety hazards and environmental concerns.

In contrast, the other types of gauges have specific advantages. Plastic gauges, while not as durable as metal, are less likely to cause injury if they break compared to glass. Digital gauges often employ advanced technology that removes the vulnerabilities associated with glass or fragile components. Metal gauges are robust and can withstand the physical demands and environments in which oil tanks typically operate. Therefore, the risk associated with the fragility of glass justifies the recommendation to avoid their use in this application.