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I tried two of the less expensive ones and they were terribly inaccurate after a few weeks and calibration helped only temporarily before the units went out of wack permanently. The third one I purchased was much better - Hanna Instruments HI 98121.
 

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My exp is same as ken31cay's. I bought one about 5 yrs ago for around $20 range. It just never seemed to be real accurate and seemed like it had to be re calibrated almost all the time.
 
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