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Apera Instruments GroStar GS3 EC Pen Tester *New W/ Box$50.00
Apera Instruments AI102G GroStar Series GS2 Soil pH Pen Tester Kit for...$291.95
Apera Instruments GroStar Series GS4-E Replacement pH/EC Combo Probe$139.03
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Apera Instruments GroStar GS3 EC Pen$65.00As an eBay Partner, userbars.org may earn a commission from qualifying purchases.