wrote in message
oups.com...
Hello John

thanks for your kind info on amp versus Voltage. Will bear that in
mind.

If i were to move it t close to a
normal electric fitting in air, it doesnt light without me
touching anything conductive. its only when i place the tip of the
tester in water that it lights ups.

from your view is this dangerous or what should i do now. change a
power head pump?

Change the powerhead.. they only cost £18.
Then you can see if the new one lights it up too so you will know if you
wasted the cash.