Hanna Instruments HI98128 pHep 5pH/Temperature Tester, 6-25/64" Length x 1-19/32" Width x 1" Height

Taking my local extension Master Gardner program we used these to do soil tests. Since then I have started my own lawn care company and I tried cheaper ones with very inconsistent results. The Hanna works very well, plus they have headquarters only a few miles from me!

I'm a homebrewer and I got one of these for measuring the pH of my grape must. I'm also a cook and a physicist and I like being able to measure the pH of lots of things. This is a nice balance between price and accuracy. This is probably as accurate as you would need for any household application. You need to have a buffer solution to store it in and you should have two solutions for calibrating. It's not trivial to use properly (you should read the manual) but it's not difficult either.

Some assembly required. Make sure you follow the instructions to put the sensors in properly, otherwise it is not water resistant. Made that mistake and had to air dry the water from the inside of the thermometer.

Works perfectly and easily. Forget ph strips, this has made controlling my mash ph very simple and quick.

When your whole aquarium relies on these two fundamental elements you don't really need anything else. Calibration is easy. You get a reading in 15 seconds. Easy to keep an eye on your tank.

This worked a few times when I first got it. Its a complicated instrument, difficult to calibrate and prone to problems. I find I cannot trust the readings and no longer use it. There are much easier to use PH meters on the market which have been designed for the customer.

I'm extremely happy with Hannah, their customer satisfaction is amazing! Their ph meters r awesome and they r pretty damm accurate!

I have used the HI 98121 and now the HI 98128. The 98121 I bought was very slow. It wasn't until I bought and used the 98128 that I realized how fast it should have been. The two big negatives for Hanna is their customer service won't necessarily give you the correct answer to any questions and the fact that it is very hard to keep the pH probe moist at all times with the design of the cap. The cap is not liquid tight, so when you put a few drops of storage solution in it, if you don't keep the meter upright at all times, the storage solution will drain out. Plus, it's a very small resevoir, so you have to constantly top it up. Very poor design for a critical function. If you get a properly functioning meter and keep the probe moist with storage solution, it will perform very well. The meter is advertised as being water *proo*, but I was told by a support person that I should not submerge it to a depth of 18", whihc is where you should sample your water from. I can say that even though he said that, I used the 98121 for about 6-7 years before the seals failed and I always submerged it to at least 18" and sometime as deep at 36". All said, it is so much easier to keep you pH at a consistent level with a meter, rather than a drop test. It's measures down to 2 decimal places which allows you to see what direction your pH is headed before it gets out of hand. The drop tests are graduated in whole numbers of 2 points, ie:70, 72, 74, 76, etc.. Using a pH meter has made keeping my pool clear and balanced a much easier job.

Does exactly what you need it to do.

Me funcionó bien para para muestras de laboratorio, de aproximadamente 4.5 de pH. Llevo un año con el y se descompuso el electrodo pero, tiene la ventaja que puedes conseguir el electrodo y reemplazarlo sin tener que comprar el equipo completo . Ya se compró e instaló y funciona excelente. Fue una buena compra.

excellent

A+

It is accurate and easy to calibrate. I use it for checking the PH of water for brewing.