Even a squirrel would save nuts for this: $6.99 (Banggood). KWS-2301C Type-C Tester DC 4-30V Voltmeter Amperimetor Voltage Current Meter Ammeter Detector Power Bank Charger Indicator.
Updated: 12-08-2025
Banggood
Warehouse in China.
Link: KWS-2301C Multi-function Digital Display DC Voltage Ammeter Power Meter
Price: $6.99
Additional Banggood coupons:
1. First page
2. Second page
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 KWS-2301C Multi-function Digital Display DC Voltage Ammeter Power Meter. The lowest price was: $4.99.
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)).