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hoppycalif · 11-21-2006, 08:06 PM

Here is a simple way to DIY this, using clear acrylic tube in 1 inch diameter and 1/2 inch diameter, plus two acrylic discs 7/8" in diameter and one such disc 3/8" in diameter. Tap Plastics has all of these shapes.

The advantages are:
The air gap has a maximum area and minimum length to decrease the response time.
The tube of indicator solution is small enough to take very little solution, but is easily viewed in the aquarium.
It can be mounted in the tank with a "heater holder" suction cup device made for a 1" diameter tube. The clip can be easily cemented to the device.
It is small enough not to be overly obtrusive in the tank.

But, the disadvantage is that it takes a syringe with a bent needle to squirt in the solution.

I haven't made this yet, but will do so shortly.

11-21-2006, 08:06 PM	#101 (permalink)
hoppycalif Senior Member Join Date: Apr 2005 Location: Sacramento, CA, USA Posts: 5,208 iTrader Ratings: 20 iTrader Positive Rating: 100% Plant Points: 227345	Here is a simple way to DIY this, using clear acrylic tube in 1 inch diameter and 1/2 inch diameter, plus two acrylic discs 7/8" in diameter and one such disc 3/8" in diameter. Tap Plastics has all of these shapes. The advantages are: The air gap has a maximum area and minimum length to decrease the response time. The tube of indicator solution is small enough to take very little solution, but is easily viewed in the aquarium. It can be mounted in the tank with a "heater holder" suction cup device made for a 1" diameter tube. The clip can be easily cemented to the device. It is small enough not to be overly obtrusive in the tank. But, the disadvantage is that it takes a syringe with a bent needle to squirt in the solution. I haven't made this yet, but will do so shortly.