They are really useful bits of kit - I also use mine to check exhaust manifold/pipes to see if I'm getting a consistent burn across cylinders. And for irritating my Mrs when she's not feeling well or I'm winding her up about her cold hands and feet.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
| 
