![]() Bullseye sight glasses don’t have this drawback, but you must be able to place them precisely or they’ll give inaccurate readings. Columnar sight glasses are mounted outside tanks, which can leave them vulnerable to damage. ![]() It’s also worth considering the risks associated with installing them. Sight glasses are an alternative to using a dipstick or simply opening a tank to look inside, because both of these options allow air, condensation and other contaminants to enter closed systems. ![]() They come in two basic forms, bullseye and columnar, and can be used to monitor oil levels as well as contaminants. A sight glass is an object that is added to a reservoir tank or machine to see the oil inside.
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