Good question and one many will wish to know.
As I'm sure you are aware many of the testers available are from the Far East/China etc and whilst perfectly suitable for most purposes are not renowned for their accuracy or tight specs. I am not surprised therefore that you find they give different readings. All measuring instruments will have a tolerance range of +/- a % and for most RC usage 5/10% variance may not matter and experience will tell the user that a part charged battery will not last as long as one fully charged.
However in the case of LiPos we need to be far more careful (as you have posted in the past) and at the very least need to ensure that all the cells in a pack are balanced and there are several chargers and testers that will protect users from risk.
Many chargers are designed to charge different types of batteries and will have built in functions to check cell voltages, charge rate, capacity etc. A good tester should in my opinion be capable of:
Selecting and testing all current battery types;
Allow for a balanced lead connection;
Checking the individual cell and overall battery voltage;
Lowest and highest cell voltage and difference between low and high;
Measuring the current being drawn under load and calculating the watts used;
Have a high current (100amp+) and max voltage capacity (60v+).
I agree with the advice from jbkiwi and have a similar GTPower type from a UK supplier and would appear to be an earlier version of that shown in the link to 4-max. I use this often to check current and wattage and it is ideal for matching props to Battery/ESC and model.
There are many reputable local suppliers on-line and it should be fairly easy to look for a supplier in your own country and check what is available against your requirements (specs) before ordering.
This is an important piece of equipment and is checking high voltages and currents that will cause serious damage to you, your model, your ESC and battery.
Would I take a chance on a cheap unknown import? Would you? I suspect not.
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