Ever bought a set of those cheap Chinese-made multimeter probes? They probably had some little plastic inserts in the banana plugs. For what reason I’m not sure, maybe to keep the safety shroud around the plug from deforming. Don’t toss them in the trash. Instead toss the probes in the trash (they’re not that great) and keep the inserts, because you can fix the broken inner jack shrouds on your $300 Fluke DMM with them!
Tektronix may be known best for their industry-leading oscilloscopes, but they also sell other test equipment, including a line of handheld multimeters in the 1990s.
The basic Beckman multimeter design that seems to apply to many of their 3½ digit models from the late 1970s onward include an LCD/processor chip assembly held together by various plastic parts that simply clip together. The later Wavetek-branded models in the 1990s changed the design slightly to use self-tapping screws to hold the stack together.
The first two generations of the popular 70-series Fluke handheld DMMs included the 21 and 23 models, which were the same as the 75 and 77 respectively, except their cases were safety yellow instead of the usual dark gray. The third generation of the 70-series also included the 21-III and 23-III models as well, but they look exactly the same as their 7x-III counterparts. It is my understanding that the only difference was that the 2x-III models were packaged with premium test leads. Just marketing, I suppose.
The HD140 digital multimeter from Beckman Industrial is another in the “heavy-duty” series, very similar to the HD110 in a 
The HP 3468A multimeter -
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