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Hydrofarm
With a strong portfolio of manufactured and distributed brands, we are one of the leading companies in the global Controlled Environment...
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Shoemakersville, US
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Meters & Controllers

GroStar GS4 5-in-1 Digital pH/EC/TDS/Temperature Meter
In Stock: 59
$141.25 $178.99 -21%
Active Air 3-Way Meter for pH, Light, and Moisture
In Stock: 1324
$10.93 $13.09 -17%
GroStar GS2 Soil pH/Temperature Meter
In Stock: 113
$202.81 $256.99 -21%
Milwaukee Instruments MA871 Digital Brix Refractometer - 0-85% Range
Out of stock
$135.25 $199.00 -32%
P3 International Save a Drop Water Meter
P3 International Save a Drop Water Meter
In Stock: 1733
$19.27 $19.95 -3%
Active Air 2-Way Moisture/pH Meter
In Stock: 119
$9.83 $11.84 -17%
Milwaukee Instruments pH600 Digital pH Pen
Out of stock
$34.00
GroStar pH Probe Maintenance Kit
GroStar pH Probe Maintenance Kit
In Stock: 71
$23.17 $23.99 -3%
Apera Instruments GroStar GS3 4-in-1 EC/TDS/Temperature Pen Meter
In Stock: 79
$95.58 $113.99 -16%
Apera Instruments GroStar pH 4/7 Calibration Solution Kit - 8 Oz Each
Out of stock
$18.34 $18.99 -3%
GroStar GS1 Digital pH/Temperature Meter
In Stock: 139
$100.93 $115.99 -13%
HM Digital TDS-3 Handheld TDS Meter
In Stock: 18
$26.03 $36.99 -30%
Milwaukee Instruments pH600 pH Tester with 1-Point Manual Calibration
Out of stock
$24.67 $35.00 -30%
HM Digital PH-80 Digital pH/Temperature Meter
Out of stock
$39.97 $47.99 -17%
TrolMaster Digital Flow Meter DFM-1 for Aqua-X Pro Controller - 1-in
In Stock: 14
$97.05 $103.95 -7%
GroStar GS4-E Replacement pH/EC Combo Electrode for GS4 Meter
GroStar GS4-E Replacement pH/EC Combo Electrode for GS4 Meter
In Stock: 70
$67.07 $79.99 -16%
GroStar GS2-E Replacement Soil Spear pH Electrode for GS2 Soil pH Meter
In Stock: 97
$143.62 $181.99 -21%
Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter
Out of stock
$36.58 $95.00 -61%
Apera Instruments GroStar pH 4/7/10 Calibration Solution Kit - 8 Oz Each
In Stock: 7
$24.30 $28.99 -16%
GroStar GS1-E Replacement pH Electrode for GS1 pH Meter
GroStar GS1-E Replacement pH Electrode for GS1 pH Meter
In Stock: 95
$42.75 $50.99 -16%
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