Canadian Wholesale Hydroponics Store - hydroponic supplies and indoor hydroponic systems. 1 (877) 226-4769.
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Hanna Combo pH / TDS / Temp tester pen
$209.95 (CDN) ea.
$207.85 (USD)
Reg. $269.95 (CDN)
Perfect little tester pen, combines pH temp and TDS into one tight unit!

It's waterproof, it floats, and it calibrates itself!

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