Ohaus PH Meter in Bangladesh - Jadu Bazar

Ohaus PH Meter

Brand Ohaus
Model ST20
Origin USA
Warranty 12 Months


After more than a century of perfecting the art of measurement through our durable weighing products, OHAUS precision is now available in a line of pen meters that provide accurate measurement of pH, oxidation-reduction potential (ORP), conductivity, salinity, and total dissolved solids (TDS). Starter pen meters are the economical option when you are simply looking for meters that will provide accurate measurement without restriction. Ohaus PH Meter in Bangladesh

Applications pH, oxidation-reduction potential (ORP), conductivity, dissolved oxygen (DO), salinity, total dissolved solids (TDS), temperature measurement
Display Liquid crystal display (LCD) display with secondary information line (on select models)
Operation 4 1.5V batteries (included)
Communication N/A Ohaus PH Meter in Bangladesh
Construction ABS Housing
Design Features Easily replaceable electrodes, automatic shut off feature

An Introduction to pH Ohaus PH Meter in Bangladesh

Simply put, pH measures the concentration of hydrogen ions in water. An ion is an atom or molecule that has gained or lost electrons, and thus has a negative or positive charge. The pH scale measures the concentration of those charges, assigning them a value from 0 to 14. Pure water at room temperature (77 degrees Fahrenheit), for example, has a pH of 7.0 and is considered neutral. Water with a pH below 7 is defined as an acid and above 7 is an alkaline. Thus, a pH measurement of 0 represents the strongest acid, and a pH value of 14 represents the strongest alkaline.

There is no understating the importance of the pH scale, which was created by Danish chemist S. P. L. Sorensen some 100 years ago. This simple mathematical formula measures the power of hydrogen in a solution and defines, in numeric terms, the properties of water. Today, in laboratories all over the world, Sorensen’s pH scale is used to measure the strength or weakness of acids and alkalis, the most important chemical compounds used by chemists and scientists. An accurate pH measurement is the starting point for just about all scientific research and experimentation.

Sorensen’s system is logarithmic. As a result, each whole pH value below 7 is 10 times more acidic than the next higher value. For example, pH 4 is 10 times more acidic than pH 5 and 100 times (10 x 10) more acidic than pH 6. The same holds true for pH values higher than 7, each of which is 10 times more alkaline than the next lower whole value. For example, pH 10 is 10 times more alkaline than pH 9 and 100 times (10 x 10) more alkaline than pH 8.

Ohaus PH Meter in Bangladesh

On a practical level, pH values impact our lives in ways we may not realize or think about very often. From the food we eat to the water we drink to the medicines we take, pH measurement is critical. Ohaus PH Meter in Bangladesh

Farmers rely on pH testing to maintain quality soil that will produce the most abundant and healthy crops. pH testing is also critical in the management and safe disposal of wastewater produced by industrial plants. Without accurate pH testing, it would be impossible to mitigate the effects of pollution such as acid rain, leaving our entire ecosystem at risk.

Indeed, some health practitioners even believe that a diet that is slightly alkaline – emphasizing fresh fruit, vegetables, roots, nuts and legumes – promotes wellness and may help ward off disease. Because our blood is slightly alkaline with a normal pH level between 7.35 and 7.45, our diet should be too, according to this theory.

At Micro Essential Laboratory, we’ve been at the forefront of pH testing technology since 1934.

What does measuring pH help us know?

It’s easy to take for granted that pH meters exist and are fairly easy to use. If we think in more historical terms, however, it’s actually pretty amazing. Click here for a page that talks about how the pH meter lets us investigate nature in ways that early chemists wouldn’t even dream of.

How does a pH meter work?

A pH meter is consisted of three different parts: an internal electrode, a reference electrode, and a high input impedance meter. Glass probe often contains the two electrodes — internal electrode and reference electrode. The internal electrode is a Silver wire covered with Silver Chloride (Ag/AgCl wire), and reference electrode is often made up of the same materials. Inside the probe is a buffer solution at pH of 7. Measured pH is the difference in [H+] between the reference buffer inside the probe and the sample solution.

The pH measurements are made by comparing the pH reading of a sample solution to that of a reference solution with defined pH, such as buffers. Therefore, it is important to calibrate the instrument with appropriate buffer solutions before making any measurements. The figure on the right is a simple depiction of a glass electrode used with pH meters


A pH measurement system consists of three parts: a pH measuring electrode, a reference electrode, and a high input impedance meter. The pH electrode can be thought of as a battery, with a voltage that varies with the pH of the measured solution. The pH measuring electrode is a hydrogen ion sensitive glass bulb, with a millivolt output that varies with the changes in the relative hydrogen ion concentration inside and outside of the bulb. The reference electrode output does not vary with the activity of the hydrogen ion. And. So so. And. So so. And. So so

The pH electrode has very high internal resistance, making the voltage change with pH difficult to measure. The input impedance of the pH meter and leakage resistances are therefore important factors. The pH meter is basically a high impedance amplifier that accurately measures the minute electrode voltages and displays the results directly in pH units on either an analog or digital display. And. So so. And. So so. And. So so

Buffer Solutions Ohaus PH Meter in Bangladesh

Buffers are solutions that have constant pH values and the ability to resist changes in that pH level. They are used to calibrate the pH measurement system (electrode and meter). There can be small differences between the output of one electrode and another, as well as changes in the output of electrodes over time.

Buffers are available with a wide range of pH values, and they come in both premixed liquid form or as convenient dry powder capsules. Most pH meters require calibration at several specific pH values. One calibration is usually performed near the isopotential point (the signal produced by an electrode at pH 7 is 0 mV at 25°C), and a second is typically performed at either pH 4 or pH 10. it is best to select a buffer as close as possible to the actual pH value of the sample to be measured. And. So so. And. So so. And. So so

Best Quality & No Compromise. And. So so. And. So so. And. So so

We are always providing the best quality Scientific Laboratory Equipment. We always try to supply our clients with the original Brand & Quality tested products with service; Scientific Laboratory equipment in Bangladesh online store – www.jadubazar.com And. So so. And. So so. And. So so
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Additional information


: Ohaus


: ST20



Meter Type

: pH

Measurement Range

: 0.0 – 99.0 °C; 0.00 – 14 pH


: ± 0.05 pH / ± 0.5 °C

Measurement Resolution

: 0.01 pH




: Yes

Temperature Compensation

: Automatic

Accuracy ± (Temperature)

: 0.5 °C

Automatic Shutdown

: Yes, After 6 minutes of non-use

Battery Life

: 200 Hours with Disposable Batteries


: 3 Point


: 1.5 in x 7.28 in x 1.77 in (38 mm x 185 mm x 45 mm) (LxHxW)

Measurement Range (Temperature)

: 0 °C ; 99 °C

Net Weight

: 3.88 oz (110 g)

Number of Buttons

: 3

pH Accuracy (±)

: 0.05

pH Measuring Range

: 0 ; 14


: 4 AG13 Batteries (Included)

Protection Rating

: IP67

Temperature Display

: Yes

Temperature Range

: 0 °C ; 99 °C

Temperature Sensor

: 50 KΩ NTC

Working Environment

: 50°F – 104°F, 85%RH, non-condensing (10°C – 40°C, 85% RH, non-condensing)

Wrist Strap

: Yes

Terms and Conditions

Cash on Delivery

Jadu Bazar is a online shopping store in Bangladesh. We sell meny product on cash on delivery. Cash on delivery is a payment collection method that requires customers to pay for the product upon delivery. That means, If you order a product from Jadu Bazar, you can pay cash for your order when the product you will received from our delivery team. But delivery cost must be paid in advance (Bkash, Nagad, Rocket) then we will send your product.

Due to the current unstable market conditions, to be sure about the stock and price and order online, call: 01919-910640

Delivery Policy

After complete a order and delivery cost paid, Jadu Bazar tries to deliver all the goods to our valuable customer

If your delivery address is within Dhaka city, products will be delivered by within 1 business days. If it is outside Dhaka then it will take 2-3 business days.

Our Business Day: Saturday to Thursday / 09 am – 09 pm. Except public holidays.

Return Policy

Instant return if goods have solid problem.

We provide great customer experience each time you shop with your Jadu Bazar. If you are not satisfied with your purchase, we ensure ‘Replacement Guarantee’. We will replace your purchased product if the product has any defect by its manufacturer or if the product is not the same one you ordered.

All you need to do is give us a call or drop an email at admin@jadubazar.com within a period of 24 Hours from the date of delivery. However, please return the product with the tags intact and in their original packaging, in an unwashed and undamaged condition. Replacement for products is subject to inspection and checking by Jadu Bazar team. Replacement cannot be possible if the product is burnt, damaged by short circuit, or broken by customer.


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