$39.89 – Monitor current: 0~6.5A, Monitor current resolution: 0.00001W, Monitor voltage resolution: 0.00001V, , Monitor current resolution: 0.00001A, Material: ABS, Monitor voltage: 4~24V, Monitor current accuracy: ±（0.5%+2）, Monitor voltage accuracy: ±（0.2%+2）, Monitor current accuracy: ±（0.5%+2）, Monitor power: 0~156W.
When I was updating this page the price was $39.89 for FNB48 USB Tester Voltmeter Ammeter with Bluetooth (in Banggood). Price history, coupons and price alert are available on this page. What is best price?
Latest price update (UTC time):
Banggood ($39.89)
Banggood warehouse is located in China. Price? Well, this price is higher than average price ($35.59) There is one great coupon!
Link: Banggood product page
Price without coupon: $41.99
1. ($39.89): BGMAI666
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG8OFFCOUPON, BGGines, BGM1TOOLS88, BG20236Tool, BGTOOS729, BG8FORMULAMX
(these coupons are old, so probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for FNB48 USB Tester Voltmeter Ammeter with Bluetooth. The lowest price was: $33.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).