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We are open 7 days a week, 9am to 5pm Monday to Friday & 10am until 3pm weekends (Winter Hours and Bank Holidays vary) 

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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.

We aim to dispatch orders received before midday Monday to Friday on the same day where possible. In most cases our items are available for 1 to 2 day delivery at a competitive price and are trackable via DPD or APC.

Delivery costs for standard items in the UK - £5.95

(Surcharges do apply to remote postcodes)

Heavy items - £9.95

Pipe - £14.95

Palletised items - Some large oversize products, typically items weighing more than 30kg, may require delivery via pallet. Standard Pallet charge is approx. £50.00. To ensure there are no delays with delivery, please include a contact number when placing the order.

Overseas – DHL and UPS, cost based on weight / volume at checkout.