I have 2 - Raytec and a Dtx Flashpoint. The ffashpoint was less than 1/2 the raytech and does a good job as long as the surface isn't too shiny - it pretty much matches the Raytec's readings. I ck temp on a lot more than just glowplugs and the Raytec is less bothered by surface finish. If you're just doing plugs, Flashpoint is not a bad choice.