Too large to fit into the Lectric XP 20" rear wheel with large 500 vdc motor..

While reasonably made, with a nice included chart, it's a bit too expensive unless you need it right away.

Don't buy a meter w/a digital or analog feeler gauge.
Although nicely made, they too do not fit the rear wheel..

I got the tool in 4 days with the free shipping option. That was awesome! I had ordered the same type of tool from another source. The other tool took 9 weeks to get to me. It arrived on the same day as the tool from Amazon. This tool was obviously assembled with more care. All the screws and pins were straight and the pointer sat at zero when there was no tension on it. Not so with the other tool. This looks to be durable, it is easy to use and accurate.
It comes with a small gage to measure the size of spokes. That might work for round spokes, but it was useless for bladed spokes. This is not as pretty as the "blue tool", but at about 1/3 the price I'll take it.

Any product made in Asia can be hit or miss. Mine needed modification at the pointer end. When performing a tension measurement the barrel portion of pointer would bind (rub) on body of tool at the outer edge of tool in the 20 to 40 range. Binding is not present when tool not making tension measurement. Tool should have been checked against a calibration standard at factory, if it passed it would have been sheer luck. If time is money to you I would probably recommend the Park Tool, if you like to work (tweak) on things then this tool is OK.

I tested it out on 3 bikes to see how accurate it was before making any adjustments. I have 1.6mm steel spokes and the gauge read over 30 on nearly every spoke. This isn't even on the chart. It should have been around 17-18. 30 isn't even possible and the wheel would not hold that sort of force nor would the spokes. This would put the spoke tension at over 350Kfg if you extrapolated the chart out