Can anyone recommend electric fence tester?

I've got the leccy fence up and running but need to get a fence tester. I've had a quick look on tinternet but can anyone recommend a good fence tester please 

  'tis a long way to come!!
This is what I've been using so far, but it's no longer working

One they sell in Mole Vally is good.  Don't know make but it is orange and has a earth stick you put in the ground and a 5 bar guage which tells you the strengh of the zap.  Around £9 or less if I remember right.  Keeps me up to speed to keep my 2 shire horses in and I have found that you only need 2 bars or more for a good zap!

One they sell in Mole Vally is good.  Don't know make but it is orange and has a earth stick you put in the ground and a 5 bar guage which tells you the strengh of the zap.  Around £9 or less if I remember right.  Keeps me up to speed to keep my 2 shire horses in and I have found that you only need 2 bars or more for a good zap!

I'll have a look , thanks