Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – 12V/24V Car Battery Tester (25.99 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t want to misguide you about the price. I don’t know if it’s good, because I don’t have enough records in my database… You can get coupon down below.
Link: Banggood product page
Coupon (24.63 USD): BGSCM11
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGSCM75, BG09a92a, BG1290c1, BGc4806a, BG456aa0, BG6b7c67, BG34182d, BG266cb8, BG37dae3, BG605e51, BG5d4295, BGe0a935, BGAMMT03
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – 12V/24V Car Battery Tester (25.99 USD)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: 20.99 USD.
You can set price alert (for Banggood).