I have just checked coupons. The lowest price I could get is $10.69 for ETOPOO Precision Digital Protractor Inclinometer Level Box (in Banggood). Go down and check coupons out. Remember to check price history if it is available. What is the best price?
Battery: AAA*2 battery (Not included), Error value: ±0.02°, Measuring range: 4*90°, IP54 waterproof is available: YES, Resolution: 0.01°, Working temperature: -12°C ~ 42°C
Latest price update (UTC time):
Banggood ($10.69)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Is it good price? Actually this is the best price in history according to CouponsFromChina database!
Link: Banggood product page
Price: $10.69
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG86417e
(there’s a little possibility that old coupon will work)
Aliexpress
There’re some similar (or not) items on Aliexpress
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 ETOPOO Precision Digital Protractor Inclinometer Level Box.
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)).