Sight Glasses & Moisture Indicators Market Value
Analysis of 950 eBay listings for sight glasses and moisture indicators.
What you'll usually pay
💡 Used ones cost about 99% more here.
👉 In short easy summary
The best value is found in brass units, which sit only 12% above the market median. High-end pricing is driven by aluminum materials (+47%) and specific vintage years like 2010 (+50%).
Price by material
Why? Prices vary by durability, ranging from brass at 29.45 to aluminum at 38.61.
Price by item length
Why? Pricing is inconsistent by size, with 2.5 in units at 22.67 and 1.5 in units reaching 54.45.
🛒 Some on sale right now
Common questions
What is the typical cost for a new sight glass?
The median price for new units is 27.58.
Are used indicators more expensive than new ones?
Yes, the used median is 55 compared to the new median of 27.58.
Which material is the most affordable?
Brass is the most affordable material listed with a median of 29.45.
How we got these numbers
Worked out from 200 live eBay listings (price range $16–$57, odd outliers ignored). These are asking prices, so use them as a guide. Last checked July 26, 2026.