Not very well up on Kewtec but can vouch strongly for Seaward.
We have a
The New PrimeTest 350 PAT Tester from Seaward
and a
Seaward Supernova Plus PAT Tester
and both work very well. We use the 350 for most aplications and the Supernova for large scale portable tool testing. We also use the Seaward Patguard elite software which of all the ones i've used is by far the best.
PAT Testing software - PATGuard Elite
I,ve used Robin, Seaward and fluke and im my PERSONAL opinion Seaward wins the day.
There easy to use with a great GUI and the communication with the software is seamless. Plus the technical support when needed is excellent, a crackin chap called Austin Daily located in the north east offices.
sounds like i work for them, but i dont LOL. its just after having 2 Robin machines all but explode while on site inside of 1 week i am greatfull for something that works so effortlessly.
Thats my 2p worth anyway