Þjöppumælir, M12 + M14 (Art. 8236)

– suitable for motorcycle and cars with 12 mm or
  14 mm spark plug
– 300 mm flexible hose
– large (ø 70 mm) easy to read scale
– scale: 0 – 21 bar / 21,5 kg/cm² / 300 P.S.I.
– blow off valve
– to probe engine valve and piston rings
– ! Shut down power of ignition coil
    before working with this tool !