A 50 Ohm dummyload is an essential part for any radioamateur as is a powermeter. The prices of such relative simple equipment is expensive, but not for us handy Hams HI.
http://users.belgacom.net/hamradio/schemas/RF_powermeter_dummyload_on6mu.htm
Many beginners trying out their skill with QRP TX, for the first time have to overcome many problems before they are able to come on the air. On usual complaint is that, every thing is working fine but the signal is not going out.
http://www.flashwebhost.com/circuit/pwrmeter.php
The circuit on this page serves as a Voltage Standing Wave Ratio meter or VSWR meter for the VHF-UHF-SHF frequency range. This includes the Wifi (802.11b/g), 2m, 70cm and 13cm Radio Amateur bands.
http://pe2er.tmfweb.nl/wifiswr/
using AD8361
http://www.edn.com/article/CA243222.html
using AD8318
http://f6bon.albert.free.fr/Milliwattmetre.html