$19.99 – 26PCS Nut and Bolt Thread Checker Nut and Bolt Size Gauge 14 Inch and 12 Metric New Individually Assembled Thread Gauge Suitable for Detecting Fixed Bolts or Threaded Holes in Enclosed Areas.
$19.99 – that is current price with coupon for 26Pcs Nut and Bolt Thread Checker (in Banggood). Price history, coupons and price alert are available on this page. What is best price?
Latest coupon and price update (UTC):
Banggood ($19.99)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. The question is – is it a good price? Hmmm, price is higher than average (which is $19.66 right now), so better set price alert down below…
Link: Banggood product page
Price: $19.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGbe98b2, BG79fa09
(these codes were not working in latest coupon update, but you can check them out anyway)
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 26Pcs Nut and Bolt Thread Checker. The lowest price was: $17.99.
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)).