Preciva PH Meter, 0.01 Resolution Digital Pen with LCD Backlit for Aquarium

Given the marmite-like quality of the reviews on this product, I thought I would wade in with my experience so far. I have a few tanks and recently really got into trying to understand water chemistry and testing. I wanted a "second opinion" on my liquid pH kits so bought this pen. It seems to confirm, though with great granularity, ease and accuracy, the results of my liquid kits, which I find quite hard to read (I always imagine that I can see the pH colour going in the wrong direction!). I tend to buffer my own RO water and this pen is accurately reading the results of the buffering – for example, I use Lake Tanganyika buffer to raise the pH to 9. I tested with the liquid kit, which read 8.5-9.5ish, whereas the pen was reading 8.9-9.1, as I would have expected. To ensure more accurate alkaline readings, I purchased a 9.18 buffer for calibration – it was only off by a little when it arrived; it was bang on the neutral buffer though! I will continue to use this product and would recommend to others. However, I would say having multiple options to read pH would not be a bad idea, just in case. Originally, I was going to spend £100 on a Hanna pH pen – which has reviews that are also somewhat mixed – and all the buffer, cleaning chemicals and storage solutions that it requires, but thought I'd first take a chance on this pen – for now, this seems to have paid off.

I bought this pH meter to monitor my kombucha brewing. So far I've found it very handy and can't really fault it for home use. Readings tend to stabilize after about 4 seconds, which is pretty good. Calibration out of the box was off by about 0.15, but the included buffer packets lets you take care of that, which is nice. One thing to note is that the calibration is linear, meaning you basically just set an offset for the reading the meter gives. You cant adjust the scale if it gets off over time, so the meter will be less accurate as you get further from the pH of the calibrant. However, this shouldn't be an issue for non-scientific applications. tl;dr: A great choice for home-brewers, cheesemakers, and more. Calibrate it on first use.

It’s so nice when something arrives and meets your exact expectations. Fast delivery, well packaged, robust casing and instructions are easy to use. Everything required for recalibration (even though it comes calibrated). There’s even a mini screwdriver included but it’s a decent one! Very impressed. I should have got one sooner. Update , it’s been only two weeks and the product has stopped working. I’m hoping it’s just crappy batteries but even still I wouldn’t have expected them to run out so quickly.

I should have known this was cheap rubbish when the instructions sheet inside had a section entitled "HOW TO CALIBRATION". I don't usually leave reviews but this was bad enough to warrant one. I used the meter for measuring whey pH during cheese making, and the meter lasted two days and 7 readings. When I used it again two weeks later the first reading was believable but after that the reading was changing dramatically every second. Even in a glass of water the reading was shooting between pH 4.5 and pH 7.5 randomly. After about 10 minutes it just died and displayed "1". I was actually going to try to send it back but I didn't use it for the first 3 weeks so it's past the date I can return it. I will take pleasure though dropping it in the bin. You really do get what you pay for.

Excellent value for money. I have been using these meters for a few years now and needed an extra one for a different job. I didn't hesitate in buying another one of these as the ease of use and backup/customer service provided by the manufacture is first class. Any email questions regarding the use and set-up of the pH Pen are answered promptly. A good accurate product with backup.

Not the cheapest by far, but neither was it expensive, so as long as it does the job it should be fine. Unfortunately mine would not calibrate correctly, I contacted the maker just to make sure I was doing it right, and yes, I was, but still not working correctly. The seller was fine with it and Amazon sent me a refund, so no drama, but disappointed it was another week of not having a working PH measuring devise.

I needed a PH meter because I'm a keen gardener so its essential to make sure the PH level of soil was ok for my plants. I had a rhododendron which was dying and it wasn't until I checked the soil PH that the soil was not acidic enough so this meter saved a life (of a rhododendron). Nice size, fits into your pocket, clear illuminated LCD display and it was accurately calibrated straight out of the box although calibration powders are included, all for less than £10. Highly recommended. Note: if testing soil PH you must dilute the soil in water first then test the water, do not put the wand directly into soil. Also good for Fish tanks, ponds etc.

I ordered this to test the water for my home brewing. It arrived quickly and was well packaged in a hard case. The case will be good to store the instrument and keeping it safe from knocks. The instructions were very clear and easy to follow. I was surprised to have not one but two of each of the sachets of calibration powder. I calibrated the instrument and it was accurate as delivered. And I have spare sachets in case I need to re-calibrate when the batteries need changing. The instrument is really easy to use and the read out is very clear. This is now part of my home brewing kit and I have used it to improve the quality of my brewing. I would recommend this to anyone and one of my friends has already bought one to use in his home brewing set up.

水槽の水質管理に購入しました。 説明書、校正剤、本体が入ってました。 説明書は英語ですが翻訳コンニャクでなんとかしました。便利な世の中です 校正液ではなく校正用の粉末が入っているので精製水を別に用意しなくてはなりません。私は家にネコがいるので頼んで出してもらいました。どら焼きあれば簡単に手に入ると思います。安いですし 電池は入っていたので直ぐ使えますね。バックライトも明るく見やすいです。 本体に白い粉付いていましたが説明欄にもある通り精製水で流せば問題ないらしいです。 本体ケースサイズ合ってないと思います、プッチンみたいなの折れてました。雑 まあ大事なのは性能ですよ、入れ物はどうだっていい。 水槽のphを測る前に校正します。校正剤はph4.01@25℃とph6.86@25℃の2種類です。どうやら温度によってphが変化するらしいですね。ph計の校正は酸性・アルカリ性でと聞いていたのでちょっと不安です。 精製水は校正剤一種に250ml必要なので1Lあれば安心ですね。(洗浄用も含めて) あとは説明書の通り作業すれば大丈夫ですね。複数回測ればより正確な値が出ます。 精製水でph5.5付近だったのでほぼ正確な値だと思います。(空気中の二酸化炭素等が溶け込む為) 1分弱で数値が安定するので良いですね。 早速水槽のphを測ってみました。 ミナミヌマエビを入れた水槽2つのうち全滅した方がph5.81 生存している方はph6.89でした。この事からもph計の値はほぼ正確と言ってもいいでしょう。 そこまでphの事など気にしていませんでしたが飼育する際かなり重要なので常備したほうがいいですね。無知は罪なり、反省しています 今後は定期的に測定して「英雄」になれるよう精進したいと思います。 ※精製水はバッテリー補充液(古河薬品工業株式会社)を使用

Bisher hatte ich den PH-Wert meines Aquarienwassers immer mit Lackmus-Streifen bzw. chemisch gemessen. Das ging bisher immer prima, aber als mir die letzten Plättchen bzw. Flüssigkeiten ausgegangen waren dachte ich mir einmal eine elektronische Variante auszuprobieren. *Generell: Naja, was soll ich sagen: Ich finde das Teil prima. Einfach ins Wasser halten und einige (ca. 40-)Sekunden später hat man den PH-Wert auf dem Display. Das Gerät ist haptisch recht einfach gestaltet (wie auch sonst bei diesem Preis) ; Mir war aber das Testresultat wichtiger als ein tolles Hochglanzgerät. *Messwerte: Die gemessenen Testwerte decken sich mit den 'mechanischen' Tests der Lackmusstreifen, als auch von z.B. Tetra-Wasseranalysen (die ich aber auf Dauer teuer finde). Ich musste das Meßgerät ca. 40 Sekunden in das Aquarienwasser halten…dann änderten sich die Meßwerte nicht mehr. Alles OK. *Kalibrierung: Zur Kalibrierung werden noch einige Päckchen Kalibrierungssalze mitgeliefert. Diese werden in 250ml 25Grad Celsius warmen Wasser aufgelöst und dann das Meßgerät reinhalten und das Meßgerät mit dem mitgelieferten(!) Schraubendreher auf die entsprechende PH-Einstellung kalibrieren. Simpel. Sollte das Referenz-Wasser eine andere Temperatur haben, sind auf den mitgelieferten Päckchen auch die entsprechend am Gerät einzustellenden PH-Werte tabellarisch aufgelistet. *Ergo: Alles OK mit dem Teil. Ich werde berichten, wenn sich Meßwertabweichungen einstellen sollten. *Anmerkung: Im Lieferumfang ist zwar eine PH-Wert Tabelle enthalten. Man muß natürlich selber wissen welchen PH-Wert man für seine Anwendungen benötigt. *Alles in allem: Gutes Teil für wenig Geld! *PS/Nachtrag: Das Gerät arbeitet mit Batterien, nämlich 4 Stück AG13 Knopfzellen...die bekommt man eigentlich auch überall.

Compré este medidor de pH hará como un año. Lo uso para controlar el pH de cremas caseras (faciales) y también de kombucha casera. Lo he usado mucho y luego no lo he usado por unos meses de modo que lo he recalibrado ahora. A penas había variado en 0.08 en el rango de pH4 en todo este tiempo. Insisto, muy fiable y preciso.

Ottimo perfetto sono soddisfatto lo raccomando. Io lo uso per la produzione di birra fatto in casa. Uno strumento che non deve mancare

Just bought and used today, so I will update later if any problems develop. The unit comes in a plastic storage box with a translated set of instructions that, while obviously translated, are easy to follow. Initially I tested some distilled water I had and got a PH reading of 5.85, so I calibrated it using 6.86 buffer solution (Buffer powder included 2 x 6.86 PH and 2 x 4.01 PH) and it was very close. I was easily able to adjust to 6.86 with the included screwdriver. The Distilled water still read 5.85 and my RO water tested at 6.8. A quick internet search and I learned distilled water is initially 7.0, as I thought it should be, but quickly absorbs CO2 and is typically around 5.8. So the meter was actually dead on right out of the box. The meter is easy to use and appears accurate. The only concern I have is when it is time to change batteries. I tried to pull the battery compartment out, as shown in the instructions, and could not easily do it. I needed to use the unit today so I chose not to try to pull the compartment out for fear of breaking it. Also the manual says the batteries are 3x1.5 v (AG- 13 button battery), but I don't know what those are or where I will find replacements. I will update on that later when I have to change batteries. For $20, I don't really expect perfection, but so far this unit has exceeded my expectations. I am using it to test my kombucha as the PH strips that I was using were terribly inaccurate and hard to differentiate the colour changes (I have perfect colour vision as I have been tested). So far I am happy with this product.