When I was updating this page, then coupon price was $17.99 for BSIDE Z1 Mini Digital Multimeter (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
BSIDE Z1 Mini Digital Multimeter Smart Pen-Type LCD 2000 Counts Voltmeter Resistance Tester Flashlight for Electronic Repair
Banggood ($17.99)
Banggood warehouse is located in China. I have no active coupons for you right now. Well, is it a good price anyway? Hmmm, price is higher than average (which is $12.99 right now), so better set price alert down below…
Link: Banggood product page
Price: $17.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGGines, BGTools8
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for BSIDE Z1 Mini Digital Multimeter is here.
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)).