Hanna ORP/Temperature Tester - HI98120

Similar to a pH measurement that quantifies how acidic or alkaline solutions are, ORP (Oxidation Reduction Potential) measurements quantify the overall state of a solution as having the ability to oxidize or reduce a chemical species. Oxidizing and reducing reagents are used to participate in chemical reactions known as redox reactions.

An important part of the ORP probe is to have a sensor that is chemically inert, meaning it cannot be oxidized or reduced itself. It must also have the proper surface characteristics to promote rapid electron exchange, a property known as high exchange current density. Two noble metals have proven to work well for this purpose: pure platinum and pure gold, both commonly used in the construction of ORP probes.

The platinum sensor is often preferred because it is mechanically simpler to produce. Platinum can be welded to glass and also has a similar thermal expansion coefficient. Sensors made of gold cannot be welded to the glass and are often placed in plastic supports applied to the glass or plastic tube by means of tiny elastomeric bungs.

Many industries rely upon ORP measurements including swimming pools, food processing, boilers and cooling towers, and plating. The measurement of ORP helps the user monitor the effectiveness of disinfecting compounds including chlorine and ozone. ORP is also used to monitor redox reactions including the use of bisulfite in the reduction of hexavalent chromium to trivalent chromium in plating wastewater.

Hanna HI98120 Waterproof ORP/Temperature Tester is a precision handheld instrument engineered for reliable measurement of oxidation-reduction potential (ORP) and sample temperature in scientific, laboratory, industrial, and water treatment settings. It offers an ORP range of ±1000 mV with 1 mV resolution and high accuracy, suitable for process control, environmental monitoring, and educational laboratories.

ORP measurement range ±1000 mV; accuracy ±2 mV; resolution 1 mV. Temperature measurement from -5.0 to 60.0°C (23.0 to 140°F) with ±0.5°C (±1°F) accuracy; resolution 0.1°C/0.1°F. Replaceable HI73120 ORP electrode with stainless steel and cloth junction provides robust, stable operation. Waterproof, impact-resistant case designed to float if dropped into liquids, ensuring durability in harsh conditions. Automatic shut-off after 8 minutes of non-use conserves battery and extends usage. Compact form factor (163 × 40 × 26 mm) and lightweight (100 g), usable in field, laboratory, and industrial process environments. Operates reliably in temperatures -5 to 50°C and relative humidity up to 100%. Used for water quality monitoring, chemical dosing control, swimming pools, wastewater management, and manufacturing process lines.

This device is an essential instrument for professionals seeking dependable ORP and temperature readings in challenging environments. Explore laboratory and field measurement instruments and ORP Meter for comprehensive monitoring solutions.