Search  for anything...
Apera Instruments

APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

    • Based on 8,876 reviews
Condition: New
Checking for product changes
$32.35 Why this price?
Save $33.65 was $66.00

Buy Now, Pay Later

As low as $8 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 10 left in stock, order soon!
Fulfilled by Amazon
Arrives Saturday, Nov 23
Order within 8 hours and 10 minutes
Available payment plans shown during checkout

Style: Regular Kit


Features

  • 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

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.

Brand: Apera Instruments


Special Feature: Waterproof


Color: Regular Kit


Age Range (Description): Adult


Included Components: PH20 Value pH tester kit


Specification Met: CE, ISO 9001, RoHS


Display Type: Digital


Product Care Instructions: Hand Wash Only


Unit Count: 1.0 Count


Power Source: Battery Powered


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


Country of Origin ‏ : ‎ China


Best Sellers Rank: #1,295 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #3 in Lab pH Meters


#3 in Lab pH Meters:


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Nov 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Best ph meter yet!
Style: Regular Kit
I recently purchased the Apera Instruments AI209 Value Series PH20 Waterproof pH Tester Kit, and it has been an absolute game-changer for my home gardening and aquarium maintenance. It arrived quickly and in perfect condition, thanks to Amazon’s reliable packaging. The box included everything promised: the pH meter, calibration solutions, storage solution, and a detailed manual. Right out of the box, the pH tester felt solid and well-made. The design is compact and ergonomic, making it comfortable to hold and use. Setting it up was straightforward. The instructions were clear, and calibrating the device with the provided solutions was a breeze. It only took a few minutes, and I was ready to start testing. What I love most about this pH tester is its accuracy and consistency. I've used it to test the pH levels in my hydroponic system and aquarium, and the readings have been spot on every time. The device is very responsive, giving me quick results that I can rely on. The backlit display is bright and easy to read, even in low light conditions, which is a nice touch. Another standout feature is its waterproof design. I’ve accidentally splashed it a few times while working with my aquarium, and it’s held up perfectly. It’s reassuring to know that it’s built to withstand such mishaps without compromising its functionality. The automatic temperature compensation is another fantastic feature. It ensures that the pH readings are accurate regardless of the temperature of the liquid being tested. This is particularly useful for my aquarium, where water temperature can vary slightly throughout the day. Battery life seems excellent so far. I’ve used it quite a bit over the past few days, and there’s no sign of it needing a replacement anytime soon. The device also has an automatic shut-off feature to save battery, which is always appreciated. Overall, I’m extremely pleased with the Apera Instruments AI209 pH tester. It’s reliable, easy to use, and very accurate. Whether you’re a home gardener, aquarium enthusiast, or just someone who needs to measure pH levels regularly, this device is a fantastic investment. Highly recommended! ... show more
Reviewed in the United States on June 21, 2024 by rick k
    • Accurate and easy to use
Style: Combo Kit
The unit functions great and is accurate. I was disappointed when it stopped calibrating one day, so I read the troubleshooting steps, one of which said to soak it in the 3M KCL storage/soaking solution. I was previously storing it in reverse osmosis water and didn't even realize it came with some KCL storage/soaking solution until I looked through my things. So I soaked in the KCL for a day, and viola, that fixed the issue. ... show more
Reviewed in the United States on September 5, 2024 by Walter
    • Thankful Plants
Style: Regular Kit
Before buying this I used a two process solution to make sure my Ph levels were right, but my plants kept withering. This pen is great and does exactly what it says. The design is compact, it’s easy to use, and my plants are thankful that I can get it right the first time.
Reviewed in the United States on October 10, 2024 by Styles by Dayeil
    • Accurate and Easy to Use - But do you Really Need to Spend $50?
Style: Regular Kit
I bought this tester mainly to verify two cheaper ones I had already. I was just not confident the ones I was using were giving me accurate readings. When I tested them with calibration solution they both read slightly off one being higher and one lower. So I decided to spend the money on a higher end model. The Apera model seems to work very well and when tested in calibration solution is usually spot on. 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 where you need to wait a while for them to stabilize and typically have much smaller and darker displays. That is the good news, however, the calibration procedure is a bit clunky compared to even the other cheaper ones I have. Partly due to the instructions which are very poorly written, hard to follow and provide contradictory information when it comes to things like storing the device. I understand it was made in China but for gosh sake, hire someone who knows how to speak and write in English to design the manual so it makes sense. In my application PH is very important so having more than one tester is not a bad thing. But it I had to pick just one and price was not an issue....then yes, I would chose the Apera model, but by a very small margin. Mainly because it appears to be a higher quality, well made device - even though the included instructions and funky calibration procedure hold it back from a five star rating. But in the end it is only slightly more accurate then the $10-$15 ones I already have. If the accuracy of the PH reading is that important to you and you want the best and do not care about spending $50, then the Apera is a fine choice. But if you are on a budget and are using a tester to check the PH of say swimming pool water, a cheaper model will work just fine. I would recommend getting two cheaper units from different manufacturers so you can check them against one another. You will spend about half of what it cost for the Apera. And as long as you occasionally test and re-calibrate them, you are better off with two cheaper models than the one more expensive one that does the same thing. ... show more
Reviewed in the United States on June 19, 2021 by E. A. Jacques
    • Very accurate and remains that way.
Style: Regular Kit
I've been using this meter for a little over a year now and it's only even needed to be calibrated once. Even then it was only off 0.1 on one of the buffers. If you want something that's accurate and not overly inexpensive then this is the one.
Reviewed in the United States on October 10, 2024 by Eric R.
    • Meets expectation of quality of product
Style: Regular Kit
Very accurate and big help with the results we were looking for. Thanks.
Reviewed in the United States on October 21, 2024 by Jen
    • This is a nice PH meter.
Style: Regular Kit
This is a really nice meter. For someone who is using it 2-3x a week. It is working well. Lets see how it holds up.
Reviewed in the United States on October 16, 2024 by Dr.Daniel Riley

Can't find a product?

Find it on Amazon first, then paste the link below.