double headed spout thing

[Vaporz1]

Just ordered some of these to try out
https://www.fasttech.com/products/2210/10047728/9626876
probably useless, but they're a couple of quid and worth a punt for preventing that last big glug of vg that sometimes takes the amount over the calculated measurement!

 

[Ment]

I can't see any benefit. What am I missing?

 

[haich]

I fill vg from big bottle to close to required amount then have a smaller bottle with a nozzle I can drip/squeeze final amount in in a more controlled way