$9.99 – ANENG B04 Digital Voltage Tester Pen AC Non-contact Induction Test Pencil Voltmeter Power Detector Meter Electrical Screwdriver Indicator – 3.
I have checked all old coupons and price is $9.99 for ANENG B04 Voltage Tester Pen 2pcs (in Banggood). You can create price alert here, copy coupons and view price history. Best price?
Latest coupon code price check (UTC time):
Banggood ($9.99)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. But wait a sec… Is it a good price? Hmmm, price is higher than average (which is $5.97 right now), so better set price alert down below…
Link: Banggood product page
Price: $9.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG20236Tool, BGTOOS729, BGeb7d2b
(these coupons are old, so probably won’t work)
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
Do you need price history chart (for all/most countries) for ANENG B04 Voltage Tester Pen 2pcs? There we go. The lowest price was: $5.94.
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)).