Heh... that looks like the pic from Video1963's auction of a iso.
The concern I have with his (and specifically the on you pictured above) is that it is only rated for 85 watts. (See the marking in blue on the top label)
However, these monitor chassis that he sells and presumably what/who you're buying from (the Weiya's) are rated at:
80 watt/1.2 amp max. (1.2A = ~132 watts @110v) for some 19" chassis
85 watt/1.3 amp max. (1.3A = ~143 watts @110v) for some 19" chassis
100 watt/1.5 amp max. (1.5A = ~165 watts @110v) for the 25" chassis
Therefore that transformer is "on the edge" for the 19" chassis normal current draw, and definitely too small for the 25" chassis, and not to mention, no headroom for the maximum draw (presumably power up or with extremely bright screens) on any of them.
I would get a larger ISO myself. Ken--what are your thoughts on the topic?
(And BTW--I think it is incredibly stupid for those chassis to be sold with a standard power plug, even if you buy the power-plug/receptacle equipped ISO... too much chance for it to be plugged in directly and cause untold damage.)