I have, unfortunately, not had the opportunity to go climbing (and thus use my climbing equipment) for a couple years. I know that such equipment, especially the rope and webbing, can degrade over time. So how can I check my equipment to tell which pieces are still OK to use and which need to be replaced?
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It's pretty hard to check gear without some high-tech equipment. Metalwork really needs to be x-rayed to see if there are any hidden cracks, and rope can be checked by cutting a length off and sending it for destructive drop testing.
Neither of those your average climber would ever contemplate. So give everything a very careful visual inspection, for the metalwork check that there are no sharp burrs that could damage your rope, no corrosion, and no distortion. For your rope, run it through your hands very slowly, checking for any lumps, bumps, or skinny bits, and check the sheath isn't frayed anywhere.
Also how equipment has been stored is important. Has it been kept warm and dry, away from UV light? Could it have been exposed to any chemicals (such as battery acid or solvents) that might have damaged it?
Since it has been a year and some of this has not been mentioned I felt compelled to do so. I know you were concerned about your own equipment, and I know this advice can be found all over the internet, but I think the following needs to be said whenever climbing gear safety is discussed:
What ages a rope most is use, so if you have stored it for a couple of years it should not have degraded measurably.
Have a look at the UIAA's document on ageing of climbing ropes for some guidance from the experts (the UIAA is the International Mountaineering and Climbing Association)
I wouldn't worry about a couple of year's lack of use.