anyone recomend descent leakdown tester?

the engine is 10 years old, and another thing i forgot to add i have 18 inches of vaccum at an idle, wouldnt it be considerably lower if i had an internaal vaccum leak? vaccum is pretty steady, but does have a little movementt to it. if that helps anything?
I could replace the intake and exhaust valve seals and see what happens, i have brand new intake and exhaust valve seals for this motor still in the bad never been opened. There are victor rienz seals. I'm just curious about this internal vaccum leak now.... I just dont think thats the issue when i have 18 inches of vaccum at idle, i'd think an internal vaccum leak would lower it to around 12 to 14 and i'd think it'd be fairly unstable vaccum, right?