02/14/2020 Bought because I needed a spearhead and an extra long probe to test pH in deep bottles. The "innovative" idea of permanently attaching a cap to the small vial of electrode solution dramatically increases the minimum probe diameter. Unfortunately, when the bottleneck diameter is less than 25mm, only the tip of the spear has the effective length of the probe. Please refer to my attached photo for dimensions. Again, as expected, this works absolutely perfectly for pH.
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