PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (1, Red, Normal)
Condition: New
$9.99
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Availability:
In Stock.
Arrives
Friday, Oct 30
At a glance
- Condition
- New
- Size
- Normal
- Color
- Red
- Number of Items
- 1
- Weight
- 2.39 oz
- Batteries
- 2 AA batteries required. (included)
Features 6
- How to use calibrationPress CAL for 5 seconds to enter the calibration mode, press in turn to select the powders corresponding to 6.86, 4, and 9.18 to complete the calibration.
- Our products come with calibration powder to verify their accuracy. The instructions on the package indicate that when calibrating the powder step, Distilled water should be added when using the calibration powder. It's just because the calibration powder needs to be mixed with distilled water
- Mini SizeThe mini size ph meter we designed allows you to easily put it in your pocket, so you can take measurements anytime, anywhere. It can help you test it whether you take it to the pool, on a trip, to the beach or camping.
- Family EssentialsAs a tool to improve the quality of life. Can be used to test drinking water, swimming pools, PH balance in aquarium, RO system, spa or hydroponics. Basically all the environments that need to test PH value can use this tester to get accurate data.
- Easy to useturn on the switch,put the probe into the water and stir (make the small glass ball fully contact the liquid) and the value can be read when the value is stable.
- Automatic temperature compensationThere is no need to care about the temperature of the liquid being measured. The PH meter has an automatic temperature compensation function, which can be adjusted according to the water temperature and water quality.
Description
Test item: water ph value Working environment: 0-80℃, RH<95% Measuring range: 0.00-14.00ph Automatic temperature compensation: 0-80℃ Calibration function: two-point automatic calibration Application scope: water hydroponics, laboratory, pool,industrial water treatment, water purifier Pay attention to the calibration sequence (6.86-4-9.18) Please note that the PH pen probe is a glass product and is a fragile product. Please do not collide with things. Once the damage is not replaceable, you must protect the probe. After use, use absorbent paper to gently absorb the water on the probe. Calibration powder:pH standard solid substance. It can be used after adding water. Suitable for calibrating any type of ph meter. Each package needs to prepare 250ML of purified water. (Note that the configured water must be purified water or distilled water. Tap water and mineral water cannot be used to configure the calibration solution. The water must be added in the required proportion, otherwise it will affect the accuracy of the calibration and increase the error) PH meter has been calibrated before delivery, the buyer does not need to re-calibrate after receiving the goods! In the following cases, the PH meter must be re-calibrated: If the backlight brightness drops significantly or the display value is blurred, the battery should be replaced. When replacing the battery, just pull out the battery compartment and replace it. NoteThe polarity of the battery.
Specs 5
| Package Dimensions | 9.02 x 2.52 x 0.83 inches |
|---|---|
| Item Weight | 2.39 ounces |
| Manufacturer | Ruolan |
| Item model number | ILEE |
| Batteries | 2 AA batteries required. (included) |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Oct 30
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Handy little ph meter
Size: Normal
Color: Yellow
Number of Items: 1
So I finally got one of these little digital pens to check my water and honestly it has made me feel like a total scientist in my own kitchen. I used to just stare at the tap and wonder if everything was okay but now I can just dip this in and see the numbers pop up right away 💧 It is basically like having a tiny expert living in your drawer who tells you exactly what is going on with your drinks so you dont have to guess anymore. I was actually suprised by how fast it works because I thought it would take ages to get a reading but it is usually done before I can even finish humming a little tune. It is super light and thin too which is great because it doesn't take up any space at all and I can even take it with me when I go to visit my parents 🏠 You just pop the cap off and stick it in the glass and then boom you have all the info you need right there on the screen. I accidentally left the cap off for a few hours once and I was worried I broke it but I just rinsed it off and it kept on working like a total champ. The best part is that the screen is really bright so I can even use it in the morning when I am still half asleep and havent turned all the lights on yet ☀️ I basically just point and click and it handles all the complicated math for me which is perfect since I am definitely not a fan of doing science experiments before I have had my coffee. It fits right in my pocket too so I can even use it to check the water at the gym or when I am out on a long walk in the park. If you are someone who likes to know exactly what is going on with your hydration then this is basically a little dream come true 🥤 Just make sure you keep the sensor clean or you might get some funny readings that make you tilt your head in confusion. I am honestly thinking about getting one for my friend who has a huge aquarium because it is so much easier than those messy drop kits with all the different colors. It is just a fun little tool that makes my daily life feel a lot more organized and I think you would really enjoy how simple it makes everything feel 🌟 It is basically like a magic wand for your water glass which is pretty cool if you think about it. I am very happy with it and I think it is going to stay right next to my favorite mugs for a very long time.
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Reviewed in the United States on December 30, 2025 by S. Ross
Better than the more expensive ones!
Size: Normal
Color: Yellow
Number of Items: 1
Works great!
Reviewed in the United States on September 16, 2026 by Andy A.
IMPORTANT: storage of glass bulb pH probes & measurement range
Size: Normal
Color: Yellow
Number of Items: 1
So far so good, the meter came with buffers for a 3 point calibration, It seems to work fine for my purposes. Also it was $12 bucks. However, the glass top of the probe arrived dry, and the instructions provide no advice to user about storing the probe properly. I will advise anyone who purchased this Meter to fill the black cap with a small amount of the 6.8 buffer solution when storing it so that the probe is never left to dry. Ideally one would purchase a separate storage solution but a pH four or seven buffer solution also works. If you store any pH probe either dry or in distilled water you might as well throw it in the trash— The glass bulb contains a small volume of an electrolyte solution with known concentration of potassium chloride and silver nitrate usually. The meter measures the difference difference in voltage between this reference solution and the measured solution and it calculates the pH from that, so it is imperative that the solution inside of the bulb stay the same as it was from the factory. Through drying or soaking in distilled water the solution can evaporate or leach out of the semi permeable membrane (the glass bulb) and change the composition of this reference solution making it impossible for the meter to make accurate measurements. Long story short, when you’re not using the meter make sure the probe is stored in the 6.8 buffer solution or buy a purpose made pH probe storage solution. EDIT: a few months in and the thing is still doing it’s job. Note that this meter has a narrower range of measurement than would be suitable for working with strongly acidic or basic solutions. I’ve noticed that it effectively pegs out like 3-4 with acids, so I don’t trust it to read anything below ~ 3.5. Haven’t tested the limit on the base side. This makes is (likely) unacceptable for lab chemistry depending on what (you are doing) but for hydroponics, soil testing and other environmental sciences not requiring measurement of pH extremes it should be fine.
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Reviewed in the United States on June 14, 2021 by Connor Osgood
Useless, it's now in the garbage getting inaccurate pH readings of my trash
Size: Normal
Color: Yellow
Number of Items: 1
Calibrated it per the instructions which stated I only needed to do the 6.86 pH test per if only .1 plus or minus accuracy is needed, versus plus or minus .01 accuracy, in which case you should calibrate it using all 3 pH powder packets (6.86, 4.00 and 9.18). Rinsed sensors with distilled water and let dry. Then I tested the accuracy with distilled water, which should be around a 7 neutral pH. The thing just started in the high sixes and just continually counted down slowly to the 5.XX, then 4.XX, then 3.XX, etc., never once settling on a pH. Would've kept going but I removed it from the distilled water. Then I pulled the batteries to reset it and decided to test it again with all 3 pH packets. Did the 6.86 fine. Rinsed with distilled water and let dry. Moved on to the 4.00. Calibrated fine. Rinsed and let dry. When I tried to calibrate for 9.18, the meter went in the high 8's and I held the calibrate button for 5 seconds per the instructions ("when the reading is close to 9.18, press the CAL button for 5 seconds). Did that and the screen then showed that it had been calibrated for 6.86 rather than 9.18, which obviously completely ruins the purpose of a calibration test and throws the calibrations all out of whack. That's when I threw it away. I guess you get what you pay for. In this case I paid 12 bucks for an hour of wasted time and a pH meter that doesn't work at all, even when you are trying to calibrate it per the manufacturer's specifications.
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Reviewed in the United States on November 27, 2021 by M. Weir
Dead
Size: Normal
Color: Yellow
Number of Items: 1
I thought it was gonna be charged when I got it, but it was dead
Reviewed in the United States on August 17, 2026 by Yin Yang
Recalibrate it every time you use it?
Size: Normal
Color: Yellow
Number of Items: 1
Product works ok I guess, but I have to recalibrate it every time I use it? Is this normal?
Reviewed in the United States on July 9, 2026 by Donald Vandeberghe
Sometimes I have fun and test it at a different fast food places or gas stations
Size: Normal
Color: Red
Number of Items: 1
I use it for everything it's awesome
Reviewed in the United States on August 29, 2026 by Fern
Aquarium and House Plants--Water Testing
Size: Normal
Color: Yellow
Number of Items: 1
This is my third pH meter from a different manufacturer and happy that I took the chance to try this out. All three meters that I have bought have different maintenance instructions. I've been comparing them to find out what works best. The Apera brand has better instructions that are easy to understand and seems to work best. But it costs significantly more. This Roulan is the least expensive brand that I could find. Yet it functions acceptably for its price. The Apera is better in that it achieves the final stable reading faster and maintains calibration longer
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Reviewed in the United States on March 25, 2026 by Paul