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Don't know about straight-sided beakers, but if you end up having to use the tall graduated cylinders, you might try using the magnetic stirrers that the chemists like (hot plate--which can be set to zero heat--with a rotating magnet beneath the heating element which causes a little magnet in the liquid container to spin and mix the liquid) to keep the temperature fairly uniform.
I want to do a lab activity using a small immersion heater and a beaker of
water. However, our beakers all have the usual sloped tops with a spout.
The clip on the immersion heater is meant for a coffee cup with straight
sides, and does not secure well to the beaker. It will fit on a tall
graduated cylinder, but then it is difficult to mix the water to get a
good temperature readings.
So I am looking for a straight sided beaker (graduated if available) to do
this experiment. I searched unsuccessfully on the interned, but only found
straight sided plastic beakers and jars. Nothing made of glass and
graduated.