Digital pH Meter Tester Pen for Water, Pre-Calibrated, High Accuracy ±0.01, 0–14 pH Range, Pocket Size for Drinking Water, Pool, Aquarium & Hydroponics (Yellow)

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.

I use it for everything it's awesome

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.

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.

I thought it was gonna be charged when I got it, but it was dead

Product works ok I guess, but I have to recalibrate it every time I use it? Is this normal?

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

Pleased with purchase

Se necesita calibrar, para poder usarlos, y los productos que requieren para la calibracion, son muy difíciles de conseguir, y por lo tanto, no he podido usarlos, para lo que los compré

ممتاز

Muito bom, de facil operação e recalibragem se caso for necessário fazer

الجهاز لا يشبه الصورة ولا يعمل وكيس ال buffer مفتوح وفارغ

Produto e muito.bom