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You have done exactly the correct thing. I have had the same experience with fancy wheel alignment, the more lights, screens, read outs and other BS to impress the customer, the higher the fee. But not disclosed is the greater possibility of malfunction and error. Very few of these gadgets are regularly checked and ever fully calibrated. Installation is often hit and miss. The operators are usually underlings capable only of following the user manuals and diligence is not usually a virtue.
There can be nothing inaccurate in a measure, a piece of string and a plump bob. Calibration and variables are not involved. Having done it properly and understood what you are doing, the outcome must be accurate.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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