Don't sell the farm for a DMM for vaping. On the other hand, if can you spend a little more you can get some benefits.
-More functions. The test probes may plug into multiple sockets
-Better accuracy
-Better battery. Most inexpensive DMMs use 9 V batteries. The cheapies use a mini 9 V battery that doesn't last more than a couple of months. A pair of replacement batteries (often, you can only buy two) may cost more than the DMM itself. DMMs that use the standard 9 V alkaline battery are a better deal all round. These are the familiar, larger rectangular 9 V batteries with the two snap-on contacts. They cost a lot less at any drug or grocery store and last for months and months.