HM Digital HMPH80 HMDPHM80 Digital pH/Temperature Meter, 0.0-14.0 0.1 Resolution

Good quality and good build Better than chinese brands Has better support online YouTube and other places Great buy

Good

You first have the keep the sponge well at times, there is not one break of humidity. When you measure pH the first reading will be wrong! but the machine seems to catch up, after a while you learn that all pH meters sometimes malfunction. The fact people don't use PH meter well is the 1th malfunction, plus the fact they don't acknowledge that the meter doesn't always work(any). To measure PH: Always wash PH meter after use, if possible buy small distilled water to rinse slightly. Never touch the meters, but you can slightly brush the tips if the meter is old. You trying to remove LT slime. If you rinsed regularly without missing one beat you likely won't have to brush for a long time, every time you do you risk breaking it. After a while the sponge will be of less desirable colour, it's time to change the meter, it will likely break soon anyway giving you more trouble than it's worth. To actually measure: Wash cup, place test water in dry cup, Place meter to dip PH meter, slightly measure, wait till meter stops moving in the direction,take real measure. It's slow to get correct reading. Use tap water to check if PH meter works(if in doubt), reference "PH of tap water" changes but slow(remember to measure this also). Tap water will form Calcium on your meter making it hard , and necessary to clean in first place. No doubt best meter i ever used, switched once and will never try that again ever. My meter for life.

Très bonne qualité et réglage rapide et précis !

If you have read any of my other reviews on PH (and EC) meters I have purchased, you'll know it has been a real frustration point for me to find a good one. I purchased three other PH meters from various manufacturers and none of them were dependably accurate and none could be calibrated easily if at all. They all cost around the same ($10-$20) operated about the same and appeared to all be built in the same factory but just branded differently and the housings were slightly different. For the most part they were clones. Even the instructions that came with the units were almost identical. The reviews were mixed too so it was pretty much a crap shoot. I finally decided to up the ante and spend a little more money (actually over two times as much), in the hopes I could finally find a reliable and easy to use model. I had already purchased an EC meter from HM Digital for the same reasons, and it has proven to be worth the extra money so I decided to try a PH meter from the same company. So far I have experienced the same positive results and have been using the meter for over two months. The meter operates very similar to the other models but is clearly not built in the same factory - the instruction sheet is a clear indication of that. It's much more detailed and actually makes sense when you go through the steps to use or re-calibrate the unit. The best part is the ability to easily re-calibrate the meter. The process is so simple compared to the cheap units that I find myself calibrating it more often which is a good thing. Other models required the use of three different test solutions to calibrate them and the required steps are about as kludgy as you can imagine. This unit requires one calibration solution and it is recommended to use one that is near the range you'll be measuring for most often. In my case it's the 7.0 solution. It comes with a nice cap that allows the unit to stand on end for storage. It also comes with a small amount of electrode storage solution (which I did not even know you needed until I purchased this one), that you use in the cap to keep the sponge moist which protects the electrode. I have since purchased a larger bottle of the solution from HM Digital so I can store it properly for a long time. I use this meter almost daily and am very pleased to finally have a PH meter I can rely on. It is easily worth the price. If you are reading this it's probably because you have not been able to find a decent PH meter, or maybe it's your first one. Either way, if you need a good accurate PH meter that is easy to use and re-calibrate, don't waste your time and money with the cheap models. Spend the extra money now and save yourself the frustrations I went through. I highly recommend this meter. It's the best you can get in the price range in my opinion and I have the experience to back up this review. Oh and one final note - I think I read somewhere it was made in Korea but assembled in the US where the others were all from China...but I don't know this for sure. It's definitely not a clone like the other cheap models. Update Nov 4, 2021 This is the second of these I have purchased. The first one ended up giving false readings after I left it in some water and nutrient solution for a couple of days by mistake. I suspect it somehow messed up the sensor. I have another tester that is my main one, which I did a review on as well, so I was able to see something was amiss. Since PH is very important to me having more than one unit is a must so you can see if there are problems brewing which did happen to me. Instead of getting a cheaper or more expensive model I decided to get another of these since it served me well for a long time when I was using it as my primary tester. It's not the best tester you can buy, but at this price point it is a very good one and I have no problem recommending it. Just make sure to not leave the probe in water or other solution for an extended period of time. I normally use a solution made to protect the sensor when storing it between uses - which I highly recommend.

+ mit der Anleitung war die Inbetriebnahme sehr einfach, man sollte nur nicht übersehen, dass man VOR dem ersten Gebrauch die Storageflüssigkeit auffüllen (Schwamm) und 15min warten muss. + Kalibrierung ist vor der ersten Inbetriebnahme NICHT notwendig, wir haben diese aber trotzdem durchgeführt-> war sehr einfach und ging schnell. Für die Kalibrierung braucht man, zusätzlich zur beigelegten Lösung, destilliertes Wasser. (die Messspitze sollte auch nach jedem Gebrauch mit dem dest. Wasser gespült werden) + toll ist noch, dass das Messergebnis automatisch an die Temperatur angepasst wird. Sowie bei wsl. jedem PH Messgerät muss man unbedingt darauf achten, dass immer genug Storageflüssigkeit im Schwamm ist und die Spitze nicht austrocknet. - Perfekt wäre noch eine kleine Box/ein Koffer zur Aufbewahrung gewesen. Dahingehend ist leider nichts dabei. -> Trotzdem 5 Sterne.