Pen Type Digital PH Meter Includes Buffer Solution

(5 customer reviews)

With a waterproof casing, LCD display and small size this PH meter is a doddle to use

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SKU: EQU-27-031 Category:


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With a waterproof casing, LCD display and small size this PH meter is a doddle to use. Low power consumption, will power off after 10 minutes of inactivity. Automatic temperature compensation with temperature display.  English instructions are included.

pH Measurement Range: 0-14pH
Resolution: 0.01pH/0.1pH
Temperature Measurement Range: 0.0~50.0° (32~122°)
C & F display
Resolution: 0.1°/1°
The Automatic Temperature Compensation (0.0~50.0°)

Includes 3 sachets of buffer solution at different PH levels.

One of our customers, Mr Martin Farrimond has very helpfully rewritten the instructions, see below:-

-> Hold

[Short] Press to switch on/off
HOLD: [Short] press to hold/freeze the reading. Short press again to unhold. In Hold mode, the decimal point stops blinking.
CAL: Calibration and temp units change.

Temp units selection:

Choice of °C or °F. Should be supplied with default to °C. To change units…
With the meter switched off, press & hold the “CAL” button, then press the ON/OFF button until the display becomes active, then release both buttons. The display blanks, showing only the temp unit selected in the bottom right. To change the units, briefly press the “CAL” button. Each press will switch between °C and °F. To select the temp unit, press the “HOLD” button. The display should briefly display “SA”, your selected temp unit will be stored and the display should show the temperature.

In normal use, the decimal point will blink once per second.

Prior to first use and from time to time, you should calibrate the pH meter.
[I think] that before using, it suggests immersing the pH meter probe (the glass bead) in distilled water for 10 mins.

To measure, ensure the glass bead and the metal temp probes are both fully immersed in the liquid [to a mx depth of 15mm]. Leave until the pH reading stabilises. Seemples.
To lock the reading, briefly press the “HOLD” button. Press the “HOLD” button once more to unlock the reading.

After use, before storing, rinse the probe in clean, ideally distilled, water and dry carefully with lint-free cloth. Be careful as the glass bead is delicate.

You need three buffer solutions: one packet of each of these should have been provided with the meter when new. Each pack can be used to make 250ml of buffer solution. Hint: buy, or save from your recycling, 3 x 250ml plastic or glass bottles! Further packs are readily available (e.g. ebay). Ideally, use a glass stirrer to help dissolve the powder (metal ones might affect the pH of the buffer test solution).

The three buffer solutions needed are pH6.86; pH4.01; and pH9.18. Make these up according to the instructions on the packets.

The meter should be calibrated with the buffer solutions at 25°C. This is important.

Fully immerse the probe in 10-15mm depth in the pH6.86 solution at 25°C. Leave until the reading stabilises, then press the “CAL” key for 3 seconds. The display will briefly show 6.86, then “SA”, then “End”.

Repeat this for the pH4.01 and pH9.18 solutions respectively. (The meter automagically recognises which PH level you’re calibrating).

It is suggested you discard used buffer solution.

Don’t immerse the probes too deep into liquid: you only need about 10 – 15mm depth of liquid.
Don’t allow liquid up into the instrument.
The probes, i.e. the bottom end of the instrument, can be unscrewed and removed – presumably to facilitate replacement, but I haven’t found any suitable replacements available.
The batteries are hidden inside the top of the instrument, which also unscrews. These are LR44 (or equivalent) and there are four of them. They are a bit of a bitch to replace and it looks like it would be all too easy to break the tiny wires soldered to the end connectors.
If the battery voltage drops lower than 3.7V, the display will blank, and [I think] the decimal point may blink [or possibly the whole display. Who knows?]. All four batteries should be replaced – don’t mix old and new.
The meter should automatically power off after 12 minutes

I hope that helps some folk!



Additional information

Weight 0.2 kg
Country of Origin CN
HS Code 9027802000

5 reviews for Pen Type Digital PH Meter Includes Buffer Solution

  1. stephen gale (verified owner)

    Seems well built and the display is easy to read. Using a PH meter is going to be more reliable and accurate than reading paper test strips. At this sort of price, you can’t go far wrong. However, the instructions included have been (almost) translated from Chinese. I have attempted to read them a couple of times and I can’t say that I am 100% confident on how to calibrate this device! I haven’t owned a PH meter before, so I don’t have much experience to go on. Maybe someone could post some calibration instructions on the product details page. Also be aware that this unit is not supplied with the buffer solutions required to calibrate the device but you can acquire these easily elsewhere.

  2. Justin Worthington (verified owner)

    Have to agree with everything Stephen has said above. Instructions could be better translated and easier to understand, also, buffer solution should be recommended as part of the purchase.

  3. Martin Farrimond (verified owner)

    As the previous reviewers have commented – the instructions are pretty much still Chinese. I have tried to translate them into useable English. Mine was supplied with the 3 packets of buffer solution, but they are readily available on ebay.

    That aside, I’m pleased with the meter. It’s probably not the world’s most accurate or stable over time, but it’s good enough for checking mash pH.

    • Robert Neale

      Brilliant, thanks Martin, I have posted your translated instructions on the product page.

  4. Mark Baker (verified owner)

    Great product in my view. Holds calibration well. To calibrate this just put into the buffer you want for 30 s or so and make sure it’s close to 20 Deg C. Then press CAL for 3 seconds and it calibrates to the buffer value. Then repeat with the next buffer

  5. Johann Delport (verified owner)

    Good little meter. Does come with the buffer solutions. As everyone have said the instructions included are about as useful as a peephole in a glass door. If only I looked at the product page to see the brilliant translation. I did however find the following youTube video very helpful:

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