Great tool to have...but you are going to probably going to have an issue on the 250...IIRC, they don't read dead short below .007...found a quazi work around for it...you can read about it here.../topic/65594-topic/?do=findComment&comment=886264....starts on page 5, post #75 on...basically you set your mod resistance to 0 & upload to device. Install a coil of know resistance, pulse the fire button to set the resistance in the device & then run the analyzer...you will probably have to let the coil cool for a bit first...and it will help if you set you pre-heat, power, etc. as low as possible to prevent the coil from getting to warm...not an exact science, but it works...you will see in the photos