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(62 ratings)
94% positive over last 12 months
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APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

4.5 4.5 out of 5 stars 8,469 ratings

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About this item

  • 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

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 7.01 x 1.61 x 1.18 inches; 3.9 ounces
  • Item model number ‏ : ‎ PH20
  • Batteries ‏ : ‎ 4 AAA batteries required. (included)
  • Date First Available ‏ : ‎ April 22, 2016
  • Manufacturer ‏ : ‎ Apera Instruments
  • ASIN ‏ : ‎ B01ENFOHN8
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.5 4.5 out of 5 stars 8,469 ratings

Product Description

Simply the most reliable pocket pH tester with the best value for general-purpose pH testing e.g. hydroponics, horticulture, pools and spas, water treatment, beverage making, education, environmental monitoring, etc. Up to 3 points of Auto. calibration and 0 to 50˚C Auto temperature compensation (ATC), 0. 1 pH Accuracy with 0 to 14. 0 pH measuring range; Auto. recognition and indication of stable values improves repeatability, saving you the trouble of guessing when to manually hold measurement. PH20 comes with a complete kit of premixed calibration solutions (4.00 and 7.00), 4 AAA batteries, and a lanyard all in a portable carrying case. Smart Self-diagnosis, warning of incorrect buffer solutions and incorrect calibrations. IP67 water-resistant. Up to 2000 hours' operation powered by AAA alkaline batteries. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.


From the brand


From the manufacturer

Features

PH20 probe

sensor shield

lcd

easy calibration

High-sensitivity pH glass membrane

Apera's proprietary lithium glass membrane crafted out of 1200˚C rare metals ensures quick and precise pH measurements.

Sensor Shield

A sensor shield is installed to protect the sensitive glass membrane from accidental damage.

Large LCD Display

Simultaneous temperature display along with stable reading and calibration icons.

Easy 1–3 point Auto. Calibration

Comes with lab-grade calibration buffers ready for use, good for up to 10 times of calibration.

applications

Suitable Applications

Battery
Powered by AAA alkaline batteries

  • Accuracy: ±0.1 pH, ±0.5˚C
  • Range: 0 to 14.0 pH.
  • 32 to 122˚F (0 to 50˚C) Auto. Temp. Compensation
  • 1-3 point Automatic Calibration
  • Up to 2000 hours of operation powered by AAA batteries.

  • Self-Diagnosis function automatically tells you what might go wrong during calibration and how to fix.

Value Series PH20 pH Tester Kit

Quick. Simple. Reliable

Apera Instruments PH20 Value pH Tester Kit simply provides reliable and quick pH measurements for general water solution applications such as pools and spas, beverage making, horticulture, education, aquarium, aquaculture, water treatment, education, environmental monitoring, etc.

  • 1–3 point automatic pH calibration
  • Auto. buffer recognition and reminder of stable readings (smiley face icon)
  • Automatic Temperature Compensation from 0 to 50˚C (32–122˚F)
  • Ready-to-use bottled calibration solutions included in the kit
ph20 kit
ph20-tall-3 PH60 ph60s GS2-tall gs4-tall pc60-z-tall
PH20 Value pH Tester PH60 Premium pH Tester PH60S Food pH Tester GroStar GS2 Soil pH Tester GroStar GS4 pH/EC/ppm Tester ZenTest Smart Combo Tester
Customer Reviews
4.5 out of 5 stars
8,469
4.5 out of 5 stars
3,077
4.5 out of 5 stars
3,077
4.6 out of 5 stars
124
4.6 out of 5 stars
124
4.2 out of 5 stars
291
Accuracy ±0.1 pH ±0.01 pH ±0.01 pH ±0.1 pH ±0.1 pH; ±0.1 EC; ±30 ppm ±0.01 pH; ±1% F.S
Measuring Parameter(s) pH, temp. pH, temp., mV (ORP can be measured with an ORP probe installed) pH, temp., mV (ORP can be measured with an ORP probe installed) pH, temp., mV (ORP can be measured with an ORP probe installed) pH, EC, ppm (500ppm/700ppm), temp., mV (ORP can be measured with an ORP probe installed) pH, temp., conductivity, TDS, salinity, resistivity, mV (ORP can be measured with an ORP probe installed)
Suitable Applications General water solutions e.g. pools and spas, education, aquarium, enviromental monitoring, beverage making, hydroponics, water treatment, etc. General water solutions e.g. pools and spas, education, aquarium, enviromental monitoring, beverage making, hydroponics, water treatment, etc. Food samples (cheese, fruits, meat products, sushi rice, yogurt, cream, sauce, etc.) and general water solutions Soil, rockwool, coco coir, hydroponics, aquaponics, fruticulture, floriculture, aquarium Hydroponics, aquaponics, fruticulture, floriculture, aquarium General water solutions e.g. pools and spas, education, aquarium, enviromental monitoring, beverage making, hydroponics, water treatment, etc.
Calibration Auto. 1 to 3 point calibration (7.00/4.00/10.01) Auto. 1 to 3 point calibration (7.00/4.00/10.01/1.68/12.45) Auto. 1 to 3 point calibration (7.00/4.00/10.01) Auto. One-tap 1 to 3 point calibration (7.00/4.00/10.01) Auto. One-tap 1 to 3 point calibration (7.00/4.00/10.01, 2.77EC) Auto. 1 to 3 point calibration (7.00/4.00/10.01, 1413µS/12.88mS/84µS)
Probe Type Regular glass bulb with sensor shield Regular glass bulb with sensor shield Swiss spear pH probe with open junction Swiss spear soil probe with PTFE junction Double-junction pH+titanium EC combo probe Double-junction pH + firm platinum black combo probe
Replaceable Probe N/A
TruRead Function N/A N/A N/A
Backlight Screen N/A
Smart Data Management N/A N/A N/A N/A N/A
Calibration Reminder N/A N/A N/A
service

What's in the box

  • PH20 Value pH tester kit
  • Looking for specific info?

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    8,469 global ratings

    Customers say

    Customers like the speed, accuracy, and ease of use of the pH meter. For example, they mention it reads the ph in less than 20 seconds, provides accurate results, and is simple to use. That said, opinions are mixed on performance, quality, and readability.

    AI-generated from the text of customer reviews

    708 customers mention517 positive191 negative

    Customers like the accuracy of the pH meter. They say it holds accurate readings, is easy to calibrate, and provides accurate results. Some say it's reliable when calibrated. Overall, most are satisfied with the accuracy and reliability of the product.

    "...Everything seals, fits, and was thought out and designed for the end user." Read more

    "Great kit. Has everything you need to calibrate meter. Reliable accuracy. Nice plastic storage box." Read more

    "This is well made, easy to use and seems to be accurate" Read more

    "...made device - even though the included instructions and funky calibration procedure hold it back from a five star rating...." Read more

    324 customers mention280 positive44 negative

    Customers find the thermometer easy to use and calibrate. They appreciate the clear instructions and the laminated instructions that come with the product. They also appreciate the crystal display and the easy functionality of the 2 buttons.

    "This is well made, easy to use and seems to be accurate" Read more

    "...It’s extremely easy to calibrate and even easier to use than most other meters...." Read more

    "...This is easy to use and calibrate. I was unaware the ph fluids had expiration dates so don't stock up like I did...." Read more

    "Meter comes in a carry case with calibration fluids and clear instructions. Has a quality feel and appearance. Calibrated quickly...." Read more

    105 customers mention75 positive30 negative

    Customers like the speed of the meter. They mention that it reads the ph in less than 20 seconds and is accurate. They also say it turns on quickly and returns the PH value and displays a smiley to show. Overall, customers are satisfied with the speed and ease of use of the product.

    "...which is easy to read during normal operation and is much quicker at determining the PH level versus the cheaper ones where you need to wait a while..." Read more

    "...Better than all the Hanna ones I’ve used, and with a quicker read out." Read more

    "...I followed the instructions and calibrated but it wasn't testing my water very quickly...." Read more

    "...It's easy to calibrate. Accurate and reliable. It returns a reading quickly. Comes with a nice case...." Read more

    85 customers mention77 positive8 negative

    Customers like the storage of thermometer. They mention that it comes with a very nice storage case lined with foam padding. They also appreciate the carrying case, which holds the calibration solution. Customers also mention that the portable case is really nice and convenient.

    "...Reliable accuracy. Nice plastic storage box." Read more

    "...Comes in a nice case too so I’m not constantly misplacing it like the others. Great product." Read more

    "...I was trying to test!lol I really like this little pen and it came with a little case and ph4.00 and ph7.00 calibration liquids so I don’t have to..." Read more

    "...Accurate and reliable. It returns a reading quickly. Comes with a nice case. Be sure to order more calibration solution and calibrate frequently." Read more

    69 customers mention48 positive21 negative

    Customers have mixed opinions about the readability of thermometer. Some find the LCD display easy to read during normal operation, with clear numbers. Others say that the screen is small and can be hard to read.

    "...It has a nice LCD display which is easy to read during normal operation and is much quicker at determining the PH level versus the cheaper ones..." Read more

    "...It is so much more accurate and easy to read than the old liquid dropper test kit I was using before to determine pH...." Read more

    "...Another thing I realized upon arrival is that I can't get an accurate reading on my saltwater tank unless I purchase the 10 testing solution, which..." Read more

    "...Easy to read backlit display...." Read more

    376 customers mention248 positive128 negative

    Customers are mixed about the performance of the thermometer. Some mention that it works well, while others say that it stopped working after a few months.

    "...Everything seals, fits, and was thought out and designed for the end user." Read more

    "...The Apera model seems to work very well and when tested in calibration solution is usually spot on...." Read more

    "...One day, a little less than 6 months, it stopped working and would not turn on...." Read more

    "I ordered this for testing the ph of plant water. Works great but seems to lose calibration rather quickly...." Read more

    360 customers mention242 positive118 negative

    Customers are mixed about the quality of thermometer. Some mention it's well-made, easy to use, and accurate, while others say it fell apart into the water. The internal parts soaked. Some say it looks and feels quality item, while other say it only lasts about 8 months and the glass probe slowly degrades.

    "Great kit. Has everything you need to calibrate meter. Reliable accuracy. Nice plastic storage box." Read more

    "This is well made, easy to use and seems to be accurate" Read more

    "...When mine kept drifting and not showing a stable/believable number I contacted Apera...." Read more

    "...Mainly because it appears to be a higher quality, well made device - even though the included instructions and funky calibration procedure hold it..." Read more

    Accurate???
    3 Stars
    Accurate???
    Although I feel this meter is accurate "enough" for my freshwater tanks it concerns me that even after the smiley face pops up that the ph continues to show numbers going up and down then eventually slows down to "almost" settling on a number/reading. However, that number is ALWAYS totally different from the number that it was on when the smiley face popped up. So I am unsure if I am to assume the number that was showing when the smiley face popped up is correct or if the number it finally settled down to is the actual reading. Things that make you go hmmm. If I have to rely on "accurate enough" I do not see myself "settling" for this meter when it comes to my saltwater reef tank. Although my freshwater tanks don't concern me as much if it's "close enough", when it comes to my saltwater tanks this could spell disaster financially. There's a light years difference in losing a $4 fish than losing a $150 fish, not to mention the cost of my corals.I was disappointed to store the meter in the Apera storage solution (purchased separately) then power it up 36 hours later and the readings were wayyyyyy off. I then recalibrated it with the 7 and 4 ph solutions that came in the kit and then the readings were much more "normal" than the original testing. My problem with that is I would have thought it would stay calibrated at least for a few tests before having to be recalibrated again after the initial calibration. Also, in the kit it states the calibration solutions must be replaced after 15 uses. Since I check my tanks at least every other day I can see this being an ongoing saga and inconvenience.Another thing I realized upon arrival is that I can't get an accurate reading on my saltwater tank unless I purchase the 10 testing solution, which does not come with the kit but I was aware of that. I just assumed once calibrated the meter would test ph all the way up to 14, as the parameters online stated. I could be incorrect but from my reading all about the meter, calibration, etc I have to assume without that 10 calibration liquid I can't test my saltwater, as it is up in the 8 digits so going over the max of 7 (the highest solution in the kit) then I won't get an accurate reading over that 7. However, I am no scientist so I may be wrong in that assumption???I did go online to see about buying the 10 calibration solution only to find that I have to purchase a whole "kit" that includes the 4 and 7 solutions, at the tune of another $33. Perhaps I would be ok with that if they sent another storage container to use to test the 10 like comes in the initial test kit with the meter for the 4 and 7, and if I felt I was not going to have to recalibrate my tester after every single use. If this turns out to be the case I am leaning more towards returning it.The main reason I gave it as many stars as I did with all the many negatives I feel come with it is due to the good customer service I received when I made a call to the manufacturer.I plan to reach out to the manufacturer, Apera, again soon to see if I am doing something wrong. If I am doing things correctly and I find I have to calibrate after EVERY use I will definitely be sending it back.
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    Top reviews from other countries

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    Colleen B
    5.0 out of 5 stars We recommend both this seller and the A1209 PH20 tester
    Reviewed in Canada on February 19, 2024
    Style: Regular KitVerified Purchase
    Uzziel
    5.0 out of 5 stars El producto está excelente 10/10
    Reviewed in Mexico on October 10, 2023
    Style: Regular KitVerified Purchase
    Amazon Customer
    5.0 out of 5 stars Very well thought out Ph pen
    Reviewed in the United Kingdom on March 5, 2024
    Style: Regular KitVerified Purchase
    Kamiel
    4.0 out of 5 stars Perfect
    Reviewed in Belgium on December 24, 2023
    Style: Regular KitVerified Purchase
    Giorgio
    5.0 out of 5 stars tutto come indicato
    Reviewed in Italy on September 6, 2023
    Style: Regular KitVerified Purchase