Profile: Hanna Instruments Inc. manufactures analytical instrumentation. We are an ISO 9001:2000 certified company. We offer chemical test kits, pH/ORP/ISE, conductivity/TDS meters, digital refractometers, dissolved oxygen probes & accessories, multiparameter system, fertigation systems, titration systems, reagents & meter for chemical oxygen demand, photometers, turbidity meters, thermometers, relative humidity tester, magnetic stirrers, mini controllers, process instrumentation, dosing pumps, lux meters and reagents.