focus the light provided from the leds through a gauge body and onto a viewing screen application_number US 70493507 A description the system of the present invention comprises two main components an illuminator and a level display these two main components interact with a conventional water level gauge 22 as can be seen in fig1 a a conventional water level gauge 22 is made up of a series of ports 3 arranged vertically along a column 2 each comprising an opening 4 protected by glass though which light may pass when installed on a water boiler or similar device water or steam or a combination of the two will pass from the boiler through the pipe 1 and into the column 2 an operator who wishes to inspect the column 2 may peer through the series of ports 3 and determine the level of water within the gauge and correspondingly the boiler as can be seen in fig2 a 2 b and 2 c an illuminator 14 and level display 23 interact with a level gauge 22 by an interface that is formed between hooks 18 on the outer housings of the illuminator and the level display and a bolt 17 on the column 2 of the level gauge referring to fig3 a 3 e the illuminator may comprise an electronic printed circuit board pcb 10 containing an array of red and green light emitting diodes leds 19 an array of piano convex lenses 13 equal.