You can get FNIRSI DMT-99 Multimeter for $29.99 using coupon code (in Banggood). Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
FNIRSI DMT-99 Digital Multimeter Intelligent Automatic Recognition Multiple Measurement Modes Recording Function Long-Lasting 1500mah Lithium Battery for Efficient Accurate Readings
Banggood ($29.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Is it a low price? IMHO this is a good price, coz it’s lower than average ($30.88)
Link: Banggood product page
Price: $29.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGa68973, BGa836bd, BGc06e02
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – FNIRSI DMT-99 Multimeter [EU] ($31.99)
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 FNIRSI DMT-99 Multimeter.
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)).