We are open 7 days a week.  9am to 5pm Monday to Friday and 10am until 3pm weekends.

Covid restrictions remain in our shop to protect you and our staff, thank you.

Welcome to our new website, its far from finished but we are working hard, please bear with us.

Hanna ORP Meter (Oxygen Reduction Potential)

Oxidation is a process in which a molecule or ion loses electrons. Reduction is a process by which electrons are gained. A measurement of the potential for these processes to occur is called ORP (Oxidation Reduction Potential). Hanna's ORP is a unique hand-held tester developed to determine this value. ORP is a result of the wide demand for an accurate, affordable ORP tester. ORP has now been redesigned to be easier to use with a reinforced ergonomic casing adding a level of durability which is unsurpassed in the field as well as a much larger LCD for increased readability. This instrument is particularly valuable because there are no chemical test kits or litmus paper that can measure this parameter. Until now the only alternative was an expensive ORP electrode used with a special pH meter with mV readings, now there is ORP. The high-tech platinum electrode assures accuracy along with fast response and excellent repeatability. In addition, the exclusive clogging resistant junction insures extended life for this tester, making clogging no longer a concern.

  • Compact - Hand Held
  • Durable Field Ready with large LCD display
  • Unit of measure is millivolts (mV)
  • Range: + 999 mV
  • Resolution:1 mV
  • Accuracy: (@20°C/68°F) + 5 mV
  • Typical EMC Deviation: + 5 mV
  • Battery Type/ Life: 4 x 1.4V / 700 Hours approx. continuous use
  • Environment: 0 to 50°C (32 to 122°F); RH 95%
  • HI 98201 ORP
  • Dimensions: (7.9" x 1.8" x 1")
  • Weight: 2.7 oz.