Apera Instruments, LLC-AI221 SX610 Waterproof pH Pen Tester, ±0.1 pH Accuracy, 0-14.0 pH Range, Suitable for Test Tube Testing, Replaceable Probe

I have purchased so many cheap ph monitors that wouldn't work or stay calibrated. I finally found one that is stable and works great.

So as far as im concerned this ph pen is reliable and i have had no problems. Came with the case, 7.0 calibration fluid and storage solution. First got the pen, the ph was off .1, i did the quick and easy calibration test and have had no problems. Have used it a handful of times and even checked the calibration before each use to be sure and its been on point each time. Definitely recommend if your looking for something above the quality of those $15 ph pens. Just try it, you wont be disappointed or at least i wasn't.Update: Product is working great, i check the ph just to be sure but the past 5 times ive used it it has been on point. Huge difference between a $15 ph pen and this one. I was searching for a product like this for awhile and read all types of reviews, i usually go to the bad ones to see what exactly people are having problems with, i have not expierenced any of what the negative reviews talked about. If you are doing the same thing i was and looking at 10 different ph pens, look no further, i promise this one is worth the money.

The pen worked and would calibrate OK for about 6 months. It stopped calibrating so I bought the replacement head assy from Apera. That worked OK for 2 months and quit calibrating this AM. Like others have stated, it's cheaper to buy a cheapie pen and replace it every couple months. Yes, I rinsed the probe tip in distilled water and stored it in buffer solution after each use. I'm down a total of about $90 altogether for this piece of junk, not to mention I'm not sure I've been giving my plants 6.5 ph water during this grow.I definitely do NOT recommend

Worth the money This is for sure a cut above the lower priced ones you can get on ebay (for as little as $10!). It has 1 point calibration, which is the main reason I got it. It requires calibration with at least every 2nd usage, but it's a very quick and easy affair to do so. I find readings tends to vary by 0.1-0.2 pH, especially in liquids that are 'frothy' at all (I use this for fruit preserves production mostly). I usually take 5 or 6 readings and go with the one that turns up the most. These are sensitive instruments, so they should not be treated roughly. That being said, it's a pretty durable little unit. It fits easily into a short test tube, but not a longer one. The case is awesome and it comes with a small supply of requisite fluids. All things said, I'm in love with this unit. I think it compares favorably with the more expensive Hanna and Oakton meters I've had in the past. The accuracy seems to be on par with any other meter less than $100.

I have gone through a dozen meters over the years. Most were OK but didn't last. Others were OK but took a long time to lock in but didn't really inspire full confidence. Others were OK but didn't fit into empty milk jugs well and that is how I mix my nutrients.This meter is the best I have used to date. It was an easy one step calibration (came spot on but I ran the process anyway) with the included solution. The meter is compact and works well with my containers. Best part is how fast and stable the readings have been. Other meters seemed to take minutes before they would stabilize but this one has a stable reading in a few seconds. Inspires great confidence and seems accurate. Combine all that with the fact the glass bulb is caged to protect it and that the probe is replaceable rounds it out.

This product, theSX610 Waterproof pH Pen Tester, ±0.1 pH..., works so nicely that I have purchased a second one for my godmother! I love it and encourage others to try this reader. It really makes measuring ph levels simple. Thanks for such a great product.-------------------------------------------------------------------IT'S SIMPLE!SO... I PURCHASED AGAIN: The SX610 Waterproof pH Pen Tester, ±0.1 pH... works so nicely that I have purchased a second one for my godmother; she loves it! She is in her 70's and needs something simple to help improve her diet intake of alkaline foods and water; and, this device works just well for her. She is now able to monitor herself and not rely on waiting until her acid level is so high that she finds out because she is at the hospital. She is now able to keep control of her health. Improvement in her acid levels were seen soon as she had control over knowing the acid levels of her food and water.I love it and encourage others to try this reader. It really makes measuring ph levels simple. Thanks for such a great product.

Works flawlessly. For the first several weeks I double checked every reading with ph strips and a blue labs meter, and it was always spot on.I do recommend getting some extra 7ph calibration liquid. You can get larger bottles of it for around $10 usd.I really like that the probe itself is easily replaced. I bought an extra one after a few weeks of use, just because I knew this was going to be my go-to ph tester from now on and I like to have a backup probe just in case. I haven’t needed it and probably won’t for a while, but for less than $25 usd, it’s worth having an extra probe.I also really like that the manufacturer includes a total of four batteries. That’s just a nice little touch that tells me they actually care about their product, and not just their bottom line. They didn’t have to do that- they’d sell just as many without extra batteries. But they’re not common like AAA.. So having extras is very nice! (They’re also not rare batteries, you can get them at most box stores.. Usually sold as key fob batteries).Very pleased with this purchase.

I screwed around with el-cheapo PH meters for way too long, i never realized there was such a vast difference between them. I use this for growing and before i bought this unit i was struggling with my grows, i was doing everything right but my plans seemed to stall and finished poorly in their last 3 weeks, one night it clicked that maybe it's my ph? so on a whim, i researched who made the best PH meters, and Apera was the one. I picked this unit up, and was delivered the next day. A simple check of my tap water with my old meter and this one quickly revealed that my problem was as i suspected. My PH was WAY WAY off. even calibrated, the cheapo meter was reading 1.0 higher PH in all cases. I so when i though i was at 6.5 ph, i waws at 7.5, and that just causes all sorts of nutrient uptake issues for my plants. buying this PH meter was a game changer, my plants finish perfectly now. So happy i bought this, now there are no questions in regards to PH. This is also super simple to calibrate too, it even detects the calibration liquid, really cool . money VERY well spent :)

Muy preciso y si muy fácil de usar,es el segundo que tengo de esta marca y la verdad es que para mi tanto el precio como la precisión es increíble,gracias

Comes with everything you need for continual and accurate PH readings. Way better than the cheap options I took first (my mistake!). I recalibrate using the solution supplied around every 4-6 weeks. Great we unit and comes in a quality case to keep everything together and protected.

je recommandequalité labo, avec la fiole pour étalonnage, plus fiole pour conserver la tête de mesure.très précis, et très bien construit

Ich bin etwas geschädigt von den Billig-pH-Metern aus China, weshalb ich notgedrungen zu diesem teureren Modell griff. Der Mehrpreis macht sich bemerkbar. Das ganze ist sehr ausgeklügelt. Z.B. ist das Meter so im Schaumstoff gelagert, daß die Aufbewahrungshülse so an das Gerät gedrückt wird, daß man mit einer minimalen Menge Aufbewahrungsflüssigkeit auskommt und durch den Dichtring läuft nichts raus.Die Messgenauigkeit ist hoch. Ich habe das Teil nicht einmal kalibriert, nachdem es nach Erhalt sofort bei einer Prüflösung den richtigen Wert angezeigt hat. Die Genauigkeit ist auch sehr gut, die +/- 0,1 kann ich jedenfalls bei meinen Pufferlösungen bestätigen. Darüber hinaus ist das "Einsteckvolumen" durch die Formgebung klein. Dann Reinigung ich verwende fließendes Wasser und habe zum Teil sehr hochviskose Flüssigkeiten, die gut anhaften, dauert nur Sekunden um es abzuspülen und obwohl es Leitungswasser ist, beeinträchtigt es das Gerät nicht.Ich bin zufrieden, wenn nicht gar begeistert. Die zweite Nachkommastelle hat man nicht, aber lieber ein Gerät mit nur einer das funktioniert, als ein Gerät was nicht funktioniert.Ich kann gar nicht genug betonen wie wichtig es ist, Vertrauen in sein Meßinstrument zu haben. Ein Gerät wie mein pH-Meter davor, das öfter mal falsch anzeigt, weil die Kalibrierung verloren gegangen ist, kann einen wahnsinnig machen, weil man keiner Messung mehr vertrauen kann. Bei diesem Gerät hier hat man nach ein paar Messungen viel Vertrauen aufgebaut, daß bis jetzt noch nie enttäuscht wurde.