Apera Instruments AI209 PH20 Value Waterproof pH Pocket Tester, ±0.1 pH Accuracy, 0-14.0 pH Range, Complete Kit

  • Easy auto. calibration with buffer recognition; auto. temp. compensation (ATC) ensures accuracy in various temperatures (32 to 122F)
  • Backed by Apera quality pH sensor with low impedance, ensuring high response rate
  • Comes in a rugged carrying case with pH 4&7 buffers and a lanyard
  • Auto recognition of stable values improves consistency, so you don't have to guess when to manually hold measurement
  • Up to 2000 hours' continuous operation, powered by AAA batteries

this is the third type of pH meter I have used over the past 6 years for my small pickling business. This is the best one so far! Easy to calibrate, easy to use and results are consistent. Time will tell on durability, but so far, so great!

This is my second purchase of this brand. The quick and accurate readings were quite impressive as always. And the portable case is really nice and convenient. Calibration solutions are pre-made. Successfully calibrated it in the 4 and 7 solutions. Though its accuracy is only 0.1ph, it's more than enough for my Kombucha brewing. You can definitely feel the quality making of the sensor and tester body, way better than the old cheap ones that I had bought. Another great advantage is that it's using AAA batteries, which are so easy and cheap to get. Not like most other brands who are using those tiny button cell batteries, hard to find and expensive to buy. Only complain is that the solution bottles are a bit hard to open by hand. You have to use a knife or a pen to cut the seal. Other than that, it's really worth the price.

Tips for use: - IMPORTANT: Get rid of the bubble in the sensor!!! A bubble will throw your readings off and will mess up your calibrations. Simply shake the unit like a mercury/spirit fever thermometer to get rid of the bubble. I wonder how many people have bubbles that are messing up their readings. I did and my goodness that made a big difference! - IMPORTANT: Stir the probe in the sample to dislodge any bubbles on the OUTSIDE of the sensor, then let it sit for a bit so the temperature measurement stabilized and the pH is compensated. - DON'T store it submerged, or wet with distilled/di water! That will damage the electrode. Store it either with tap water (with minerals and other "normal stuff") or a 3M KCL solution (this is the better choice). - Insert the batteries the correct way :-). - Calibrate FIRST with the 7pH solution, rinse, and THEN calibrate with the 4pH solution. (not sure why, but that seems to be the recommendation for pH probes).

I use this pH meter when investigating streams. I have used many different brands, and usually they don't last a season, or worse, they begin to fail when many reading are required in a single stretch. Thus far, this instrument has out performed all the others this season. Of course, the season's not over yet. It comes with a nice protective field case that also hold the buffers, so onsite calibration is a snap. The only problem I've had is some of the new batteries I installed were bad... but that's not the instrument's fault.

This is the best pH pen I've owned yet. The value here is understated considering all you get. I was pleasantly surprised that the calibration solution were thoughtfully designed with end user in mind. The unit itself is waterproof, which places it into another category altogether. Many waterproof units are much more expensive. I have not had to calibrate it since the 1st time. I'm not sure if I like the vertical display better than the typical horizontal display that a traditional pen uses but this unit provides a lot of useful info that is easy to read on this larger screen. Also, it has been very accurate so far. I have an HM digital pen that has been good for a while but I do have to calibrate it from time to time where this one seems to have maintained its accuracy for several months. I would recommend this to everyone.

I bought this back in Jan. 2017, I use it every day and so far this meter has been great. I was calibrating it every week for at least one month and it never changed as in ( holding calibration ) so I now only calibrate once a month. The only minor gripe I have is the reading takes a little longer than manufacturer's claim. In other words, when the smiley face appears it indicates that the reading is complete (not so) I have to gently swish it around for another 30 seconds or so to get the true reading. Not sure why it acts like that but to me, it's not a big deal and for the price range of $45.00, it outperforms my $125.00 Milwaukee MW102 PH and Temperature Meter. Because of being extra cautious with MJ plants, I always keep backup meters to reference them against each other so I bought this 2-pack of cheaper meters that work quite well. Note: I would never trust these cheaper ones on their own. Digital pH Meter, Etekcity 2 Pack 2011 Plus High Accuracy Water Pen Tester Pocket Size Design with ATC (Automatic Temperature Compensation), 0-14 pH Measurement Range

This was my first pH meter and I had a few questions before ordering. Chandler at Apera got back to me moments later with the answers. After a couple of more exchanges I was impressed with the level of Customer Service from Apera, so I decided to give the PH20 a try. Well, upon receiving the meter I was also impressed with the fact that this meter was already calibrated, right out of the box! I still went through the calibration process to "lock" in the "Low\4" and "Medium\7" calibrations- solutions provided. This process was easy (must do calibrations in the right order) and the meter was right on the mark. Over the last couple of weeks I have been testing this meter to see if there was any drift, and I can honestly say that there hasn't been any. I used this meter to close my pool this year and I'm more confident this winter my levels are correct. I feel this meter was the right decision for me- coming from having no meter and considering the numerous junky ones out there with padded favorable reviews, this meter will serve me well with accurate readings for hopefully the next couple of years or so. At that point, I would definitely feel confident in sticking with Apera- they have some really nice pieces in their catalog.

I'm brand new to hydroponics and came across this while looking for something solid. It is pricey but I've sorta learned the hardway about buying cheaper tools and instruments. Pros Awesome packaging. Came in a hardsided carry case with everything neatly slotted and secure. Came with the batteries, not a big issue but I thought it was a good touch Feels solid and so far has been reasonably accurate (within the parameters I need) Cons I have a bit of laboratory experience and I still found it a tad finicky to calibrate; I'm by no means should be considered a professional in any sort of lab or industrial hygiene type environment but spent my hours working with various instruments. The instructions can be a bit confusing (especially before morning coffee) and it took me four or five tries to get it calibrated but once I did it seemed set. I've only had it for around 48 hours so this should be considered an initial review. Disclosure: The company rewards (bribe really) you to leave the amazon review so you get some free calibration solution. Now, I think this is more than fair as they make no mention of what sort of review you leave and it can be difficult for companies to get folks to review things unless they are broken or junk. The reward for a review by no way impacted this review but I felt it best to mention it.

This is the one! I had bought one of those yellow ph meters. I'll just say it was worthless. So I ordered the one everyone said to buy the Apera PH20. This one is awesome. I opened it up read the instructions how to calibrate it was so simple and the buffer liquid is included. After quick calibration I put it to use. It turns on quickly and returns the PH value and displays a smiley to show its good reading. The autocalibration is great, no turning a little screwdriver. Overall it's a great ph meter at a great value.

I'm not a scientist--I'm a home cook trying to make hot sauce without poisoning my family. You need to get the pH below 4.0 to be sure it's not going to spoil in the bottle (possibly causing botulism, which is nothing to mess around with). I wasn't going to use it all that often, so the first time around I bought a cheaper meter. I could never get it to calibrate. I'm not sure whether it was defective, or if I was just using it wrong. The instructions were total crap--sketchy, and written by someone with only the vaguest acquaintance with English. With nothing better than that to go on, the thing was useless. This meter is altogether different. I had to try a couple of times to get it calibrated, but the instructions made it easy enough to figure out what I was doing wrong. After that, I had no trouble using it. Sure, it cost more, but I guess it's worth it to be reasonably sure of not killing anybody with my cooking!

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