I have a Gmate Smart some where. It actually plugs directly into a smart phone got it more as a novelty than anything. It's so small I kept losing it in my pocket. Never expected much from it as was not disapointed to be proved correct but it was OK in an emergency as you could carry it in your wallet if needs be..
Unless you test a batch of each type of meter, you don't know if a particular model is always accurate/inaccurate or just the particular one you tested.
Unless you test a batch of each type of meter, you don't know if a particular model is always accurate/inaccurate or just the particular one you tested.