Has anyone actually measured the volume (in mL) dispensed each pump?

It varies by viscosity and liquid level. The spring in the pump has a constant force and 1oz is probably for water. Which has a density of 1 gram per cubic centimeter so anything higher will be slower and lower will be faster. Faster requiring it to be mixed with a gas like 1% carbonated water with .99 g/cm^3

How long is the straw?

the straw is 8 inches with an additional 4 inches for the pump, hope that helps.

does it fit wen bottles

I don't know what a wen bottle is.

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