It's not worthless, but it's not accurate either.
It's better than nothing to get an idea that will always be a bit...or a bit more than a bit... low. That is... maybe close and maybe 20% to 60% off on the low side.
Looking at the TE [Tyndal Effect] with a laser pointer gives 'some' idea of how low. A very bright heavy TE means very low. Almost no TE means somewhat low.
ken
At 07:28 AM 10/14/01 -0700, you wrote:
>>>>
I recently bought a TDS(Total Disolved Solids) meter to measure ppm. I just wanted to know if that was a good way of testing. It said it had been calibrated before shipment. Thanks, Carol<<<<
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