Extech PH50 pH meter has an easy to calibrate single CAL key with automatic pH buffer recognition (4, 7, and 10pH). Pen's waterproof housing (meets IP67) protects meter from damage operating in a wet environment.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to 
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