Actron Compression Tester

Not Vehicle Specific
Part Number: CP7821
Features & Benefits

This handy push-in compression tester has the same scale range as the compression tester kit CP7827. Allows you to measure pressure within the combustion chamber as the piston comes up on compression stroke.

  • 0 to 300 PSI (0 to 2100 kPa)
  • Full 2-1/2 In. easy-to-read face
  • Includes user manual
  • Universal rubber adapter fits all spark plug holes
Product Details
Part Number: CP7821
Weight: 0.25lbs
Case Included: No
Color / Finish {DO NOT USE}: Black
Compression Increments (psi): 5
Detachable Hose: No
Fuel Compatibility: Gasoline and Diesel
Gauge Display Type: Analog
Hose Material: Rubber
Hose Overall Length (in): 2
Maximum Compression Reading (psi): 300
Package Contents: Tester
Plug Adapter Thread Size: None
Push-Button Release Valve: No
Shaft Attachments Included: No
Size (in): 2.5
Shipping Information: Overnight and Two Day shipping are not available for PO Box, APO/FPO/DPO or US Territory addresses.
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    Actron/Stem compression tester

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    This review is hidden because you have chosen to ignore Member 947227406. Show DetailsHide Details

    Not the most accurate

    1 of 1 people found this helpful

    You really gotta push down hard on this gauge to seat the rubber insert over/in the spark plug hole. Even then, its hard to tell if you have a tight seal or not. My advice, go with the threaded style of compression tester for the best reading.

    Pros: Small, lightweight, cheap

    Cons: Questionable accuracy

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