Hot Tip.....

When using an Exergen DX501 with the Ninja you need to place an exhaust gasket over the Exergen head or else the gun's window WILL contact the plug electrode and cause damage. Push the gasket up as far as it will go- this will stop the sensor window from hitting the electrode. I think the DX501 is the only Exergen model that has this problem with the Ninja's head.

Exergen has been made aware of the situation and will be informing the engineers of the problem.

My sensor window has plug material on it from the contact. They were kind enough to offer me a repair/replacement/calibration for informing them of the Ninja's head design.