7W5R eh...

could be 7 watt resistor, 5 ohm.

Usually they have the color bands as mentioned above, or in the case of ceramics they have a number. Id have to go look at some of my notes to decode the ceramic type but color bands are easy, there are a bunch of online calculators. As BrenR suggested, if you have a DMM just set it to resistance and measure it, you can just clip the leads onto it without un soldering it, but probbly wont get an accurate reading.

Haoleb's Audio/DIY Website