Buy or Make a Leak Down Tester?????

[herb.wilson@uno.edu]

Would like to start doing leak down tests on my engine on a regular basis. Harbor Freight sells one (- Harbor Freight Tools - Quality Tools at the Lowest Prices) for $39 but I read it is junk. Is there a decent leak down tester available for < $100 and from where? Also, read a post about a homemade version (How To Make An Engine Cylinder Leak Down Tester). Any good?

[boats.net]

We bought ours at Snap On tools but don't remember the cost.