There's a 10ml syringe at walgreens that comes with a little rubber cone-shaped thing (I'm being very technical here...) that you're supposed to stick inside of medicine bottles to help you use the syringe to draw out the correct dose.
It works really well as a bubble counter.
1. Pull the plunger out of the syringe.
2. Attach some tubing and a check valve to the syringe pointy end
3. Fill syringe with water halfway
4. Stuff the cone-shaped thing into the bottom of the syringe and attach the outgoing tubing to it using a male/male connector (found in any pet store airline connector kit).
5. You're done!
I built one of these yesterday as I was prototyping my DIY CO2 reactor (not working yet, but getting there!).
Here's another writeup with pictures about the syringe thing someone did.
http://www.aquaticquotient.com/forum/showthread.php/21661-DIY-CO2-bubble-counter-and-checkvalve
It works really well as a bubble counter.
1. Pull the plunger out of the syringe.
2. Attach some tubing and a check valve to the syringe pointy end
3. Fill syringe with water halfway
4. Stuff the cone-shaped thing into the bottom of the syringe and attach the outgoing tubing to it using a male/male connector (found in any pet store airline connector kit).
5. You're done!
I built one of these yesterday as I was prototyping my DIY CO2 reactor (not working yet, but getting there!).
Here's another writeup with pictures about the syringe thing someone did.
http://www.aquaticquotient.com/forum/showthread.php/21661-DIY-CO2-bubble-counter-and-checkvalve
