$6.54 – Power supply: 2x AAA batteries (not included), Test voltage range: 90-1000V AC, Color: Yellow/Blue(Optional), Safety level: CAT II 1000v, Product size: 139 * 25 * 16.8mm/5.47*0.98*0.66″, Frequency range: 50-500 Hz, Material: ABS plastic.
When I was updating this page the price was $6.54 for ANENG 1AC-D Non-contact Voltage Test Pen (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Latest coupon code price check (UTC time):
Banggood ($6.54)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Good or bad price? This price is higher than average price ($4.49) for this item.
Link: Banggood product page
Price: $6.54
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGM1TOOLS88, BGTOOS729
(there’s a little possibility that old coupon will 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
Here is price history (for all/most countries) for ANENG 1AC-D Non-contact Voltage Test Pen. The lowest price was: $3.99.
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)).