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That's what I use personally. Also you can cut the last coil off, so one end resembles a wine bottle opener and you can screw it into meat when using hair rigs.

Jim, read through my comments and I've never said compressibility had any significant effect on the depth we are talking about. I just thought people might like a bit of a "QI" style fact that's all... Hence the smiley following my first comment.... I never intended for it to blow up as it...

Given into insults now you realise you don't know what your talking about then. :) merry xmas Dave.

In the end I managed to get 3 match top 3 kits from Felindre for £100 delivered, just in case anyone else might be looking for some. They are actually the old Technium poles top kits, but they fit perfectly fine. Thanks guys

You clearly said you didn't understand .....

Jim, you calculations are almost right. In short what would happen now, if you recalculated for 2 metres or 3 metres, is the effect of atmospheric pressure would decrease as a percentage of the total pressure. The change in pressure would be the same at all depth though. the formula you need...

Strange you seem to think psi stands for percent..... Just about sums up you and others arguments :rolleyes: It's actually a 8.7% difference. PSI is pounds per square inch just for future reference Dave ;)

If the atmosphere is 950mbar it will be 1150 mbar at 2 meters. If the atmospohere is 1050 is will be 1250 at 2 metres. So its a difference of 1.45 PSI :) As for how much mater is compressed, someone has already quoted wiki as saying its 1.8 percent. I've never said it would affect shallow...

I was tempted to post that Ant :D

Dave, have you studied thermodynamics or fluid mechanics?? And water is compressible but had very little to do with any of this. Which confuses me as Jim stated he didn't understand the influence of air pressure on water pressure, then went on to try and lecture me on hydraulic systems...

Linear pressure will be higher in shallower water because water needs to flow faster for the same volume flow rate. Downward pressure wouldn't increase/decrease much for "steady state" flow, for a given depth.

Hopefully a couple more on tuesday :D

I am Geoff :) best part is, I don't think I've ever checked pressure/ water temp or air temp before going fishing... I just go whenever I can :)

Pretty sure you've just told me a formula I've already stated.... If you want to know how much of a change it can be ill tell you. The difference between 950mbar and a 1050mbar day will be a meter in pressure level. At 2 meters abour 85 percent of the pressure will be due to air pressure, not...

Yeah. Far better than my korum neoteric mark 1. Really light and powerful. Great for the money.

Total pressure =( depth x density of fluid x gravity) + atmospheric pressure. So as you can see atomospheric pressure dirrectly affects the water pressure. The deeper you get, the more negliable it will become. However as we're talking about very small depths maybe it is important ?? At 10...

I wonder how much the air pressure influences oxygen being disolved in water? As pressure increases would it be "driven" more easily into water?

Jim as Darryl has quoted from wiki they are compressable. Infact in very high pressure hydraulic systems you do have to take it into account. Especially where precision is required... Also its how some pressure vessles are checked for structural soundness. You pump water in and compress it to...

I wasn't rolling my eyes at you Chris, I was rolling them at the seller so to say....Sorry if it came across wrong

Oh yes it is :);)