The coupon price for ANENG SZ01 Multimeter is $16.99 (in Banggood). You can create price alert here, copy coupons and view price history. What is the best price?
ANENG SZ01 6000 Counts Auto Range True RMS Digital Multimeter High Precision Resistance Frequency Tester – Red
Latest coupon and price update (UTC):
Banggood ($16.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Low/high price? From what I can see this price is higher than average price ($13.97).
Link: Banggood product page
Price: $16.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGGines, BG422c1e, BGad5d4f, BGM1TOOLS88, BG20236Tool, BG20efce, BGTOOS729
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
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
Here is price history (for all/most countries) for ANENG SZ01 Multimeter.
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)).