Posted By Smurfer Robert I've used a Castle GA2003 pocket HARM meter which is easy to use except it will only do a single axis at a time so you have to do 3 runs and change the axis each time if you want all 3 axes. My colleague has used the Castle GA2001 which does tri-axial measurements and he's found it works well. Another to consider is the Larson Davis HVM100 - i've used it for WBV measurements and, once you've figured out how to program it, it is very versatile (need HAV and seatpad accelerometers to do both these though). As far as I'm aware it's the only one which will do WBV by the VDV method as well as the A(8) method but this won't be of interest if you're only looking at HAV. Can hire this from Ashtead technology. See if you can get a free try-before-you-buy!