does not have to be fancy.
Most scrap metal merchants will sell you a length of steel for a couple pounds. Bend over the handle end and put something bright on it. Last thing you want to do it head but the sharp end and easier to find if you leave it stuck in the ground
Not that we were safety conscious when were were kids LOL
Google will find you several home-build probe instructions. So have a go at making one.
When I cut them, I removed all the tyre fabric/rubber first, so I could find the weld on the hoop, and cut next to that. I had to use a "Dremel" type tool with a carbide stone, some chunky wire-cutters I tried hardly made a mark. The internet tells me this type of wire has tensile strengths typically 1700 - 2000 MPa. For comparison, "12.9" grade steel bolts are 1200 MPa.
And on the bicycle theme, a bike wheel spoke would be OK for a short probe. They're not spring steel, but they are strong and moderately springy. Diameter is normally 2.0mm, road bike lengths are about 290mm. A decent bike shop will charge 25p for a single stainless steel spoke.
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Mobile radio antenna rods are a couple of mm thick and springy steel. These come in typical lengths of about 30" (for CB antennas), and can be picked up at most truckstops or ham radio shops (not that theres many of those anymore!). I use an antenna rod Araldited into a wooden file handle.Fusion wrote:Probes are usually about 1/8th inch diameter spring steel (3mm - 4mm?), and the steel tube handle (old mountain-bike handlebar?) is brazed or silver-soldered onto the end. Not welded, as that ruins the spring steel. Some have tungsten carbide tips fitted on them, but I guess that's a luxury.
So have a go at home-building one.
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It is so simple (if you can weld, or no someone who can).
Here you'll find a simple drawing of the construction.
Specialy made for you. Good luck with it.
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