Features:

• Completed kit comes with adapters for most applications
• Check the condition of your piston ring & valve seats
• 3" gauge features dual color scale. 
  0-300 PSI
  0-20 kPa
• 4 Spark plug thread adapter: 
  M8 x 1.5
  M10 x 1.0
  M12 x 1.25
  M14 x 1.25
• Quickly and accurately check compression on petrol engine
• 400mm flexible extension
• 2 Pc rubber cones ends for quick check (No need to thread into head)
• Blow mold case included