--- product_id: 414749778 title: "Hanna InstrumentsHI 98121 Combination pH/ORP/Temperature Tester" brand: "hanna instruments" price: "3058 zΕ‚" currency: PLN in_stock: true reviews_count: 5 url: https://www.desertcart.pl/products/414749778-hanna-instrumentshi-98121-combination-ph-orp-temperature-tester store_origin: PL region: Poland --- # Waterproof design 1-2 point pH calibration Automatic temp compensation Hanna InstrumentsHI 98121 Combination pH/ORP/Temperature Tester **Brand:** hanna instruments **Price:** 3058 zΕ‚ **Availability:** βœ… In Stock ## Summary > 🌊 Dive into Precision! ## Quick Answers - **What is this?** Hanna InstrumentsHI 98121 Combination pH/ORP/Temperature Tester by hanna instruments - **How much does it cost?** 3058 zΕ‚ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/414749778-hanna-instrumentshi-98121-combination-ph-orp-temperature-tester) ## Best For - hanna instruments enthusiasts ## Why This Product - Trusted hanna instruments brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Built to Last:** Non-clogging fiber junction and replaceable electrode extend the life of your meter. - β€’ **Clear Insights:** Large LCD screen enhances readability, so you can focus on what matters. - β€’ **No More Guesswork:** Automatic Temperature Compensation (ATC) ensures precise results without extra calculations. - β€’ **Ready for Adventure:** Waterproof design allows the tester to float, making it perfect for fieldwork. - β€’ **Precision at Your Fingertips:** Achieve accurate readings with one- or two-point manual pH calibration. ## Overview The Hanna Instruments HI 98121 is a versatile combination pH/ORP/temperature tester designed for professionals who demand accuracy and durability. With features like manual calibration, a waterproof design, and a large LCD screen, this tester is perfect for both lab and field applications. ## Description Hanna InstrumentsHI 98121 Combination pH/ORP/Temperature Tester ## Features - One- or two-point manual pH calibration for obtaining results across a wide range - Non-clogging fiber junction and replaceable electrode to prolong life of meter - Automatic Temperature Compensation (ATC) eliminates need for extra calculations - Waterproof and floats if dropped in water - Large LCD screen for readability ## Images ![Hanna InstrumentsHI 98121 Combination pH/ORP/Temperature Tester - Image 1](https://m.media-amazon.com/images/I/417CsyljyUL.jpg) ![Hanna InstrumentsHI 98121 Combination pH/ORP/Temperature Tester - Image 2](https://m.media-amazon.com/images/I/515rsA4QI2L.jpg) ![Hanna InstrumentsHI 98121 Combination pH/ORP/Temperature Tester - Image 3](https://m.media-amazon.com/images/I/51tzPRGR1xL.jpg) ## Customer Reviews ### ⭐⭐ A lot of effort needed to get it working *by C***L on Reviewed in the United States on 27 April 2014* I bought the Hanna HI 98121 meter to test swimming pool water. I have never used a pH/ORP meter before and did not know quite what to expect. It required a lot of effort to get it working, but in the end it works well and I am happy with it.As others have found, the storage solution shipped in the cap had dried up. I was unable to get the pH reading to stay in calibration and the ORP function gave erratic results. So I exchanged it for another of the same model.The replacement meter had exactly the same problems. The instructions say to soak it for one hour in HI 70300 storage solution if the pH electrode had dried out. However, I had to soak it for 4 days before the pH reading would stay in calibration.The ORP function was still somewhat erratic, went way down if the solution was stirred, and took as long as 90 minutes to settle to a stable value. The instructions recommend soaking in HI 7061 cleaning solution to clean the electrodes, but that did not help. Hanna also recommends polishing the ORP electrode with jeweler’s rouge, but that did not help either. Some other manufacturers recommend polishing the platinum ORP electrode with baking soda. I gently polished the platinum ORP electrode several times with baking soda on a moistened Q-tip and it worked! The ORP function now gives a stable reading in 2 to 4 minutes. (Do not polish the glass pH electrode.)Since both meters I tried arrived dried up, I suspect the initial problems may have been due to old stock or improper storage rather than a manufacturing defect. I have read that pH electrodes have limited lifetime, even in storage, so I would try to find a source of fresh stock if I bought again.The meter requires additional purchases of HI 70300 storage solution and HI 7061 cleaning solution as well as pH 4.01 and pH 7.01 calibration solutions to calibrate it and keep it working.This model has a replaceable pH electrode, (p/n HI 73127), but it does not have the renewable reference junction that some other Hanna models have.In summary, the meter did not work as received, and it required quite a bit of research and effort to get it working. Someone more familiar with this type instrument would probably have less trouble. However, it is now working well and gives easier and more precise readings than a standard pool test kit.UPDATE APRIL 12, 2016. As mentioned above, I was originally able to get this meter working fairly well. However, it soon developed problems again. The ORP reading got slower and slower, taking over an hour to settle. Cleaning the electrode did not help. Then the pH reading got slower and slower. I bought a replacement probe ($53) directly from Hanna to (hopefully) avoid any problems with old stock. However, the storage solution packed with the new probe had long-since dried up, and its performance was even worse than the original one. It takes about 1.5 hours to get a stable pH reading in pool water.After 2 years of frustration, I have found the Hanna HI 98121 meter to be an expensive instrument that never worked well. The yellow pH meters that sell for under $20 work better. I would not buy it again or recommend it. I am downgrading my rating from 4 stars to 2 stars. ### ⭐ Received a defective unit. Unable to return it *by Y***T on Reviewed in Canada on 2 June 2023* Just received the unit today. After trying to calibrate pH. Wasnt able to calibrate it.After a few minute. One of the battery exploded with a big bang.Try to return it. Its impossible. Try Amzon associate. No answer! Very disapointed of the quality of service.Stay away from that company. The minimum warranty here in quebec is 10 days! ### ⭐⭐⭐ Great when it behaves itself *by A***R on Reviewed in the United States on 29 August 2013* Half the time it gives stable results that settler quickly and give me confidence that it's doing a good job. On the occasions where I cross-checked it against other methods (more on this in the next paragraph) it has matched well. The calibration was pretty decent out of the box but I did a 2-point calibration in pH 4 and 7 buffers anyway just to be sure.However the other half of the time this thing randomly jumps throughout the full pH range of 0-14. I haven't proved it to myself yet but it might be getting influenced by my cell phone which was in my pocket on all of those erratic incidents. pH meters need to be absurdly sensitive because the resistance of the sensing cell is roughly 10 billion ohms. It's like the most sensitive volt meter you will ever see. They aren't easy to make well, and frankly, this thing is nearly at the rock bottom of the price range. From now on I'll leave the cell phone elsewhere when I use the meter.I use it in both our hot tub (where the ORP function is a good way to be sure I get enough but not too much shock treatment into the water), and our fish pond. Of course it should be rinsed well clean water after every use, and consider it mandatory to use the storage solution (I use the Hanna 70300M) when you put it away. That will keep the pH bulb and the reference wick very happy for years. You don't need to be a chemist (I am one) to get good results (at least some of the time), you just need to follow the direction sheet. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/414749778-hanna-instrumentshi-98121-combination-ph-orp-temperature-tester](https://www.desertcart.pl/products/414749778-hanna-instrumentshi-98121-combination-ph-orp-temperature-tester) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-04-25*