According to my DB the lowest price is $29.99 for FNIRSI LCR-ST1 Mini Smart Tweezer LCR SMD ESR Tester (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
FNIRSI LCR-ST1 Mini Smart Tweezer LCR SMD ESR Tester Resistance Capacitance Inductance Continuity Diode Test Measurement Tools – 1
Latest price update (UTC time):
Banggood ($29.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Price? Hmmm, price is higher than average (which is $27.23 right now), so better set price alert down below…
Link: Banggood product page
Price: $29.99
Old coupons (from the oldest to the newest): BG6f1ec6, BGEEUMEGA21, BGedd552
(you can check these old coupons out, but these probably won’t 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
Price history (for all/most countries) for FNIRSI LCR-ST1 Mini Smart Tweezer LCR SMD ESR Tester is here.
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)).