Reddit reviews bayite Pack of 5 Three-Wire Calibratable DC 0~30V Blue Digital Mini Voltmeter Gauge Tester Mount Car Motorcycle Battery Monitor Volt Voltage Meter 0.36" Blue LED Display Panel
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This is Three-Wire Voltmeter. Three-Wire connection enable the Voltage Test Rang from 0.00 to 30V. (Two-wire meters cannot measure the voltage that is below 3V);Measurement Accuracy: 0.01(0.01 - 9.99V) / 0.1(10.0 - 30.0V); And the meter is CALIBRATABLE: The screw on the back is used to Calibrate the meter.BRIGHT & NICE Reading: Display: Three 0.36" digital LED Tube; Display Color: BLUE;Reverse Polarity Protection: The meter won't burn out if reverse polarity is applied, but the screen will display nothingNOTE: When measured voltage is larger than 30V, the voltmeter will be damaged.
Edit: A diagram has been added to the ablum. https://imgur.com/iWlRv3C
My latest portable induction heater. 1200 mah lipo with 2 amp micro usb balance charging. Pressing the button activates the induction module and displays the current battery voltage so you know when to charge. The overall dimensions are 4.75" x 3.5" x 1.75". I'm still waiting on glass tubing in the right diameter, in the meantime I've been using an 18mm stem with a piece of cork in the bottom. Now that I've got the internal dimensions, i can make a wood enclosure. This plastic was a pain to cut, and cracked in a few places.
Here are the parts i used:
3S Lipo Battery - $6.82 (I used a 1200 mah battery, but this will work and is pretty cheap)
https://www.amazon.com/gp/product/B00MVQ8T6I/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
Induction Heating Module - $14.84
https://www.amazon.com/gp/product/B01C71XKZ6/ref=oh_aui_detailpage_o08_s01?ie=UTF8&psc=1
Micro USB DC-DC Boost Converter - $1.73 each
https://www.amazon.com/gp/product/B07CNQPN94/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1
3S 12V 10A Lithium Battery Protection/Balancing board - $2.80 each
https://www.amazon.com/gp/product/B077ZY7Z3G/ref=oh_aui_detailpage_o04_s01?ie=UTF8&psc=1
Digital Voltage Meter - $2.40 each
https://www.amazon.com/gp/product/B00YALV0NG/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1
IRLB3034 N Channel Mosfet - 5.72
https://www.amazon.com/gp/product/B00HKHW9UU/ref=sr_1_1?ie=UTF8&qid=1527532137&sr=8-1
15K Ohm resistors - $0.65 each
https://www.amazon.com/gp/product/B0185FIPIA/ref=sr_1_3?ie=UTF8&qid=1527532172&sr=8-3
Switch - $5.11
https://www.amazon.com/gp/product/B007Q84P8C/ref=oh_aui_detailpage_o08_s01?ie=UTF8&psc=1
Container - $1.25 each
Purchased at Target, can't find a link.
Total - ~$41.34
If the charger and the FC are saying ~15.3, I'd assume the multimeter is incorrect (though it's possible you just got a bad connection, the batteries in the meter are dying, etc.)
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The only way I know to check if a meter is out of cal is to check it against a known source.
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I have about 6 of these little voltage displays with XT-60's soldered to them to use as quick voltage testers. I only have so many because I lose them, but it does give me peace of mind being able to test the same battery with multiple meters and see the same voltage come up every time.
I already had the volt meters and XT60 plugs lying around, so I just had to buy a cord and stick everything together with solder, heat shrink, and hot glue. Happily enough, my B6AC's DC input uses the same plug, so I can use this to charge 1S batteries when I'm out and about, too. (Not much point in charging 4S this way unless I have something like a 5Ah pack on me, but I guess it's a possibility.)