D D DIYnotBot 4 Aug 2013 This image is referenced in the forum thread 'Testing Flame Sensing Devices'
D D DIYnotBot 29 Jan 2014 This image is referenced in the forum thread 'Ignition/Ionisation probe correct way to test'
D D DIYnotBot 18 Dec 2014 This image is referenced in the forum thread 'Off to See a Vokera Linea max'