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Sale!

7.01 pH Calibration Solution 8oz

$7.50 $6.75
General Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH pen or meter. General Hydroponics™ technicians check each batch to ensure that their solutions are precisely calibrated and yield reliable readings each time they are used.
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Sale!

7.01 pH Calibration Solution Quart

$20.95 $18.86
General Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH pen or meter. General Hydroponics™ technicians check each batch to ensure that their solutions are precisely calibrated and yield reliable readings each time they are used.
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Sale!

4.01 pH Calibration Solution 8oz

$7.50 $6.75
General Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH pen or meter. General Hydroponics™ technicians check each batch to ensure that their solutions are precisely calibrated and yield reliable readings each time they are used.
Add to cart
Sale!

4.01 pH Calibration Solution Quart

$20.95 $18.86
General Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH pen or meter. General Hydroponics™ technicians check each batch to ensure that their solutions are precisely calibrated and yield reliable readings each time they are used.
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Sale!

HM Digital 1000 PPM Calibration 3 oz

$7.95 $7.16
For optimal performance, re-calibrate your meters periodically or if testing TDS or conductivity levels in wide or different ranges.
  • NaCl calibration solution.
  • Comes in lightweight HDPE plastic bottles.
  • Sealed with a coated foam liner.
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Sale!

Hanna 1500 ppm solution – small 230ml

$13.95 $12.56
GroCheck conductivity solution made from high quality Potassium Chloride is standardized and calibrated. Conductivity value at 25°C: 1,500 ppm. Comes with factory analysis certificate.For use with:
  • Oakton Eco TDS Pen
  • GroCheck TDS Cont Meter
  • GroCheck pH/TDS Cont Meter
  • GroCheck Handheld pH/TDS/EC Pen
  • GroCheck Combo Meter
 
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Sale!

Hanna 1500 ppm solution – large 500ml

$20.49 $18.44
GroCheck conductivity solution made from high quality Potassium Chloride is standardized and calibrated. Conductivity value at 25°C: 1,500 ppm. Comes with factory analysis certificate.For use with:
  • Oakton Eco TDS Pen
  • GroCheck TDS Cont Meter
  • GroCheck pH/TDS Cont Meter
  • GroCheck Handheld pH/TDS/EC Pen
  • GroCheck Combo Meter
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Sale!

Hanna 1382ppm Calibration – 230ml

$11.95 $10.76
reads 1382ppm on the NaCl scale (1934 on the 442 scale)Can be used with most meters with a sliding scale 
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Sale!

pH Cleaning Solution

$17.95 $16.16
Clean the liquid junction of your electrodes once a day or at least once a week to prevent clogging and to maintain accuracy. Immerse the electrode in the proper cleaning solution for about 5 minutes.
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Sale!

Hanna Groline Quick Cal 230 ml

$15.95 $14.36
Groline Quick Cal is a quick calibration solution for use with Hanna’s GroLine pH and/or EC/TDS meters. Using the Quick Cal function found in compatible meters allows for a single point calibration for pH and/or conductivity sensors. Each bottle has the lot number and expiration date. Hanna’s line of calibration solutions have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.
  • Hermetically sealed to maintain freshness
  • Two calibration solutions for the price of one
  • Expiration date on label
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Sale!

Hanna Groline Quick Cal 20 ml Packet (each)

$1.50 $1.35
Groline Quick Cal is a quick calibration solution for use with Hanna’s GroLine pH and/or EC/TDS meters. Using the Quick Cal function found in compatible meters allows for a single point calibration for pH and/or conductivity sensors. Each bottle has the lot number and expiration date. Hanna’s line of calibration solutions have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.
  • Hermetically sealed to maintain freshness
  • Two calibration solutions for the price of one
  • Expiration date on label
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Sale!

Hanna Groline 7.01 pH 20 ml Packet (each)

$1.50 $1.35
Groline 7.01 is a high quality pH 7.01 calibration buffer that is NIST traceable and supplied with a Certificate of Analysis. Hanna calibration buffers have the lot number and expiration date clearly marked on the label and are air tight with a tamper-proof seal to ensure the quality of the solution. Hanna’s line of technical calibration buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.
  • Supplied with Certificate of Analysis
  • Accuracy of +/- 0.02 pH @ 25°C
  • Temperature chart of the actual pH value at various temperatures printed on each bottle
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