If it's under 50 bucks it's just a gadget--they're really ultrasonic.
For one that uses the laser for distance measurement and has any kind
of real accuracy you're looking at over 150 bucks for a Leica Disto or
one of its competitors.

--
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--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)

One of my employees trusted the electronic type for ordering carpet,
an expensive mistake. We replaced it with an laser model from Bosch
and haven't had trouble, but it was many times that cost. (though
less than what we lost on the carpet project)