I agree you can adjust the IP without an in-line adjustment tool. On most regs that means removing the LP hose a few times to make each adjustment, and the major issue there is time.
In line adjustment tools are pretty useless on some regs - like a D400, Poseidon second stage, etc.
In line adjustment tools are not needed at all on most Dacor second stages where the adjustment was done externally after removing a C-clip by pressing in and turning the hose to engage and rotate the orifice.
Finally, inline adjustment tools are pretty useless on double hose regs as well.
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But with that said, they are nice to have and make adjusting the regs that use them a much simpler, faster and more precise process. I have several and I tend to pick them up now and then on e-bay as they come in some very interesting shapes and designs.
In line adjustment tools are pretty useless on some regs - like a D400, Poseidon second stage, etc.
In line adjustment tools are not needed at all on most Dacor second stages where the adjustment was done externally after removing a C-clip by pressing in and turning the hose to engage and rotate the orifice.
Finally, inline adjustment tools are pretty useless on double hose regs as well.
----
But with that said, they are nice to have and make adjusting the regs that use them a much simpler, faster and more precise process. I have several and I tend to pick them up now and then on e-bay as they come in some very interesting shapes and designs.