$41.99 – KINGBOLEN BM550 Car Battery Tester (Banggood, Aliexpress: KINGBOLEN BM520 Battery Tester For Car 6V 12V 24V Batter Analyzer Multimeter Cranking Charging Ripple Test (the best price with coupon)).
Latest update shows that KINGBOLEN BM550 Car Battery Tester costs $41.99 (in Banggood). Just check coupons out (with price alert and history). Do you want to know what the best price is?
Latest coupon and price update (UTC):
Banggood ($41.99)
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. Is it cheap? Hmmm, price is higher than average (which is $30.52 right now), so better set price alert down below…
Link: Banggood product page
Price: $41.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG68b373, BGSCM11, BGRJANBM52, BGAMMT03
(probably won’t work, but you can try them out)
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 KINGBOLEN BM550 Car Battery Tester. The lowest price was: $29.04.
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)).