Compact magnetic stirrer with removable electrode holder HL

Quick Answer: Compact magnetic stirrer with removable electrode holder HL is a small bench stirrer fitted with a detachable arm that holds a pH, conductivity or other electrode in the stirred sample. A magnetic stirrer with electrode holder keeps the probe at a fixed depth and clear of the spinning bar during a measurement.

Why the Electrode Holder Matters

A pH or conductivity electrode held by hand drifts deeper or shallower, touches the beaker wall and is sometimes struck by the stir bar, which can crack a glass membrane. Leaning it against the beaker rim is little better. The holder on this stirrer grips the electrode at one height and position, so the sensing tip stays immersed, clear of the bar and in a steady flow of liquid.

Stirring gives a quicker, steadier reading because fresh sample keeps reaching the electrode surface, and for the same reason calibration buffers and samples should be stirred at one speed. With the electrode fixed, a series of samples can be measured by swapping beakers under the holder, and readings can be logged over time while a reaction proceeds.

Being removable, the holder can be taken off for cleaning or when the stirrer is needed for plain mixing. The HL in the title is not explained in the listing and may be a series or supplier code. No heating is listed, which suits measurements normally made at room temperature.

Specifications

Measurements Made Easier

• pH measurement of soil extracts, water samples and household products in stirred beakers
• Conductivity readings of salt solutions and natural waters at a steady stirring speed
• Ion-selective measurements, such as nitrate or fluoride in water samples
• Logging temperature or pH over time while a reaction mixture is stirred

Protecting the Electrode and Stirrer

• Set the electrode tip above the stir bar with a clear gap, and start stirring slowly to check that it is not struck.
• Rinse the electrode with distilled water between samples and store it as its maker advises; pH bulbs must not dry out.
• Remove the holder and wipe it after measuring corrosive or staining samples.
• Keep the stirrer’s cable and the meter’s cable away from spills at the front of the bench.

Why Choose LabEquip

Stirrers with electrode holders are bought for water-testing benches, chemistry measurement stations and environmental science labs. LabEquip lists this model in General Lab Products; it pairs with meters such as the wireless pH meter sensor, and orders can be discussed through the contact page.

Frequently Asked Questions

Why should the sample be stirred during a pH reading?

Stirring keeps fresh solution at the electrode, so the reading settles faster and reflects the whole sample. Keep the same speed for the calibration buffers and the samples.

How far above the stir bar should the electrode be?

Leave a clear gap of a centimetre or so between the tip and the bar, and keep the tip well covered by liquid. Start stirring slowly and watch that the vortex does not expose the sensor.

Can the holder take any electrode?

It is made for standard laboratory probes, but diameters vary between makers. Check the fit of your pH or conductivity electrode when ordering; that is the one detail worth confirming at enquiry.

Does the stirrer heat the sample?

No heating is listed in the title. That suits pH and conductivity work, because both readings change with temperature and are normally taken at room temperature.

Why is the holder removable?

So it can be cleaned after corrosive or sticky samples and taken off when the stirrer is used for simple mixing. Removing it also makes the compact stirrer easier to store.

Can a temperature probe be used at the same time?

Yes, if the holder or a separate clamp keeps both probes in the liquid without touching each other or the bar. Recording temperature alongside pH or conductivity helps explain small shifts in the readings.

Last Updated: September 2026