Go to Staples and get a rectangular plastic office waste paper basket. Make a wooden frame to prevent it from tipping over.
Silicone sealants or PVC adhesive shouldn't bother the chemistry. You need to be concerned with the adhesive tolerating the 5% concentration sulfuric acid electrolyte. Most epoxy/plastic based ones will.
Digital thermometers are available from Radio Shack (low end) to McMaster-Carr or MSC (high end) the same goes about acid compatibility.
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