You need a bubble counter that can adapt to your needle valve. Like this.http://www.barrreport.com/trades-swaps-sales/3787-co2-equipment-fs-regulators-reactors.html
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You could make it also, this is a pic from rex griggs site.
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can also try this, it's a checkvalve siliconed into a syringe and filled partially with just plain water, or saline solution if you prefer...then attach between CO2 and tank - all done!
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