Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Operating temperature: 0 ° to 40 °, Power voltage: 220Vac±10% / optional 110Vac±10% / 45-65hz (there is a 110/220V switch key behind), Relative humidity: < 80%, Display: 2.8-inch TFT LCD / resolution 320x 240, Size: 90mm * 190mm * 300mm (width * height * depth), Storage temperature: - 10 ° to 70 °, Interface: standard USB Device / RS232(or 485)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Coupons for ET5410 DC Electronic Load Battery Capacity Tester? Nope, there’re no coupons in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGaf8080, 13f142, BG8dc51d, 2022ACTIESNL, BG8bcf69, BG10600f, BGdb7c54, BGTools8, BGGines
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for ET5410 DC Electronic Load Battery Capacity Tester? There we go.
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)).