Home › Sight Glasses & Moisture Indicators
Sight Glass Market Value
Current market data for 666 sight glasses and moisture indicators listed on eBay.
What you'll usually pay
$28.5 typical price
Most are between$17–$48
Brand new$29.5
Used$36.49
On sale now666
💡 Used ones cost about 24% more here.
👉 In short easy summary
Used units command a premium with a median of 36.49 compared to 29.5 for new items. The highest value is found in 24 in models, which sit 56% above the market median.
Price by item length
Why? Price increases significantly with size, ranging from 29.5 for unspecified lengths to 44.5 for 24 in units.
🛒 Some on sale right now
Common questions
What is the median price for a new sight glass?
The median price for new units is 29.5.
Do used indicators cost more than new ones?
Yes, used units have a median price of 36.49 compared to 29.5 for new.
Which length is the most expensive?
The 24 in length is the most expensive with a median of 44.5.
How we got these numbers
Worked out from 200 live eBay listings (price range $17–$48, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 1, 2026.