What is the ball made of?

It is made of glass. How do I know? I just accidently crushed mine when I put it back together after putting plumbers tape on both connectors and the regulator because it leaked air.

Do i use the middle, bottom, or top of the ball for measuring reference ? also, important: can you answer this with 100% certainty of your claim?

Bottom of the ball. I am willing to stake your life on it (not mine though, the thing costs $17, how certain can you be for $17?).

Can this be used to measure carbon dioxide flow? is there a conversion factor for converting the flow rate to co2?

Yes, of course you can! You'll need to apply a factor to the scale reading or recalibrate it yourself with carbon dioxide. There's a chart of the factors for a large variety of gases relative to air on the Mattheson website - search on-line for "Rotameter Conversion Factors". Because this rotameter is calibrated for oxygen and not air, you'll need to ratio the relative factors for the two gases. Oxygen is 0.951 and carbon dioxide is 0.808. Anyone who says you can't do this doesn't know what they're talking about :)

Hi, We are planning to purchase the product for our lab. Due to it will belong to the, is there an email to get a quote for it?

With Amazon you can always get a printable receipt for your purchases. Undrt Returns and purchases, click View Invoice.

Jiawanshun Oxygen Air Flow Meter 0 1 1 5lpm Gas

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💨 Master your oxygen flow like a pro—precision meets durability!

BUILT TO LAST WITH COPPER - Robust copper connector guarantees long-lasting durability and reliable gas sealing under pressure.
VERSATILE OXYGEN MONITORING - Ideal for home brewing, aquaculture, and malt oxidation—wherever precise oxygen flow matters.
USER FRIENDLY PRESSURE ADJUSTMENT - Designed for easy calibration with gas cylinder output pressure set between 0.1-0.2 Mpa for flawless operation.
PRECISION CONTROL FOR PERFECT FLOW - Accurately measures and regulates oxygen flow from 0.1 to 1.5 LPM, ensuring optimal performance every time.
TRUSTED BY PROS LOVED BY HOBBYISTS - Highly rated with 4.2 stars from 118 users who value quality and affordability in flow regulation.

The JIAWANSHUN Oxygen Air Flow Meter offers precise measurement and regulation of oxygen and other single-phase gases within a 0.1-1.5 LPM range. Featuring a durable copper connector and easy pressure calibration, it’s perfect for applications like home brewing, aquaculture, and malt oxidation. Trusted by over a hundred users, it balances quality and affordability for professional and hobbyist use alike.

Specifications

ASIN	B01N0UWZ2T
Best Sellers Rank	#50,371 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #30 in Flowmeters
Date First Available	December 27, 2016
Item Weight	3.52 ounces
Manufacturer	JIAWANSHUN
Package Dimensions	5.2 x 3.15 x 1.85 inches

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