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  • ‎$14
  • ‎$257
5 in stock
GroStar EC Calibration Kit (2.77 EC, 8 oz. each)
$14.99
10 in stock
GroStar GS1 pH Pen
$115.99
2 in stock
GroStar GS1-E replacement pH electrode
$50.99
10 in stock
GroStar GS2 Soil pH Pen
$256.99
2 in stock
GroStar GS2-E replacement Soil Spear pH electrode
$181.99
10 in stock
GroStar GS3 EC Pen
$113.99
  • Save 7%
2 in stock
GroStar GS3-E replacement EC electrode
$49.99 $53.99
10 in stock
GroStar GS4 pH/EC/500ppm/700ppm/Temp (5-in-1) Combo Pen
$178.99
2 in stock
GroStar GS4-E replacement pH/EC combo electrode
$79.99
10 in stock
HM Digital COM-80 EC/TDS/Temp Waterproof Hydro Tester
$42.95
10 in stock
HM Digital PH-200 Waterproof pH/Temperature Meter
$101.92
50 in stock
HM Digital PH-80 pH/Temperature Meter
$46.50