How accurate are home made manometers?

[iMark]

https://scontent-b-lhr.xx.fbcdn.net/hphotos-prn2/1536556_10153711249075075_993630764_n.jpg

Decided to make my own for less than £10 rather than being charged at least £40... 30 minute job for me.. I couldn't justify taking it to a garage but I seem to have got rid of my flat spot and the bike is idling without being a fanny and jumping between ~1100-1300~ RPM sitting nice around 1200 now with very little fluctuation.
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K8 GSXR 1000
"G" : you got him to have a look at a forum which seems to have established a picture of an erect penis in a cat's mouth as it's mascot and thought he might consider it ok?

[RhynoCZ]

It's very accurate, go ahead and try it.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[iMark]

I already done it Rhyno
I was just curious to see if other people though they were accurate
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K8 GSXR 1000
"G" : you got him to have a look at a forum which seems to have established a picture of an erect penis in a cat's mouth as it's mascot and thought he might consider it ok?

[Islander]

[DrSnoosnoo]

if the liquid is at equal height between the two tubes, then they're balanced. just because it isn't mercury and have numbers it doesn't matter
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I'm Sam; Northern, Ginger, Lover
Did have: '95 ZZR600 '83 CG125 '97 ZZR1100 '15 Hypermotard 821 SP Do Have: '10 ZX10R

[iMark]

Liquid won't rest in the middle on these if balanced it will just stop raising in one bottle and lowering in the other when it's in equilibrium but yeah I understand the theory of it, Just wondered what other peoples opinions were on the accuracy of taking the cheap route of making your own..
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K8 GSXR 1000
"G" : you got him to have a look at a forum which seems to have established a picture of an erect penis in a cat's mouth as it's mascot and thought he might consider it ok?

[uberkron]

I've done this in the past when a vacuum gauge was unavailable. Worked out ok.
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i ride a zip 50 2smoke. It overtakes a hundred times a day.

[SteveZZR]

It's simple physics.

Accuracy is only determined by your accuracy when building it