How do YOU test diesel Glow Plugs?

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next-to-normal, Jul 30, 12:14pm
i decided to replace all mine, and the price for them in nz were 30 each i found a place in the uk, and got 5 of them at 6 pounds each and 10 pounds post took 5 days to get here, i got them from The Green Spark Plug Co they wereBosch

intrade, Jul 30, 5:52pm
best plugs are bosch duraterm

next-to-normal, Jul 30, 9:05pm
thats the ones i got for6 pounds and am happy with them