Hanna Instruments pH & EC Meters

About

Hanna Instruments is a laboratory instrument manufacturer, and the GroLine range is its horticultural line. These are proper meters with replaceable, serviceable electrodes rather than sealed pens - which is why a Hanna meter is still accurate three years in while cheap testers drift within months. Combined meters: The HI-9814 GroLine pH / EC / TDS / temperature meter - one instrument for every reading you need. See all pH and EC meters . pH testers: HI-98115 GroLine pH tester and the waterproof HI-98118 pH and temperature tester. EC testers: The waterproof HI-98318 EC / TDS / temperature tester. Continuous monitoring: The HI-981420 pH / EC / temperature monitor for permanent reservoir installation. Electrode care: Quick Cal calibration solution, HI-70300 storage solution and HI-7061 cleaning solution, both 120ml - browse calibration and storage solutions . Why choose Hanna Instruments? Serviceable electrodes. The reason cheap pH pens fail is that the glass bulb dries out and cannot be replaced. Hanna electrodes are designed to be stored wet, cleaned and recalibrated, so the meter keeps reading true. Hanna Instruments FAQs Why does my pH pen drift? Almost always because the electrode has been stored dry or never cleaned. Keep it in storage solution - never plain water - and clean it periodically. How often should I calibrate? Monthly for typical home use, more often if the meter lives in a reservoir. Quick Cal does pH and EC in one solution. Do I need a monitor or a handheld? A handheld is fine if you check daily. A continuous monitor like the HI-981420 makes sense in recirculating systems where drift between checks can cost you. Why buy Hanna Instruments from The Hydro Bros? We stock the Hanna Instruments range in full, ship discreetly across the UK and Europe, and know these products because we use them. With excellent customer reviews on Trustpilot and staff who actually grow, you get the right kit first time.