hp probook 6470b power supply

[fastKitty]

I'm needing to get a power supply for an HP Probook 6470b.   When I take the bottom cover off it, it shows the input voltage but it's really hard to read.   There's an 18.5V over a 3.5A number and what looks like 19.5V over a 3.33A but the second voltage number isn't very clear at all.    It looks more like a 19.5 than 18.5 but the upper loop of the digit is really splattered in making it hard to tell if it's really 19.5 and not another 18.5.

When I went to the specs for the model, HP gave some power supplies at 18.5V and 19V power but this second number listed definitely ends in .5 and is definitely NOT 19V.    When I search online for the model, I see people selling supplies rated at 18.5V, 19V and 19.5V for this model.

Is there a definitive input voltage it should take?

[fastKitty · Accepted solution]

I found another machine where the writing wasn't smudged on the label and will answer my own question for the benefit of anyone else who might come across this.   It reads: 18.5V 3.5A or 19.5V 3.33A.   

Am also guessing that given this, a 19V power supply will also probably work if in the 3.5A range.