Reddit mentions of Naruekrit R3-XIKQ-AD0G Proof and Tralle Hydrometer with 12' Glass Test Jar

I use a Proof and Tralle Hydrometer. Not too expensive. Very accurate, especially when proofing back spirit for consumption.

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https://www.amazon.ca/gp/product/B00FDOHMHM/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1

tl;dr - I'd get this one, a spare hydrometer, a blowoff tube and enough bottles for 5 gallons of your beer.

I don't know about the quality of the items here but the main differences are:

• clear vs. opaque fermenter (6 Gallon Fermonster fermenter with spigot, stopper and airlock)
  
• thermometer vs. none
  
• hydrometer vs. none
  
• star san & cleaning tablets vs. no sanitizer & fermenter's favorites oxygen wash
  
• no coupon vs. 20% off coupon
  
  My opinion:
  
  
• I prefer a clear fermenter, it's cool (but keep them away from sunlight).
  
• Thermometers and hydrometers are vital. $20 you'll never regret spending, and keep a spare.
  
• Star San or a comparable sanitizers are vital. Keep some on hand in a spray bottle instead of dumping it all out after you brew.
  
• Fermenter's Favorites Oxygen Wash can supposedly make the bottling process easier if you're struggling to remove the labels and glue from old bottles. I formerly used soap and Star San without a problem but I keg now.
  
• Discounts are always nice.
  
  The $30 difference isn't worth the lack of Star San, hydrometer, and thermometer in the kit. Spend the money.

You are going to have to get a Hydrometer to check if the gravity is changing, or is already back down to 1.000 (or less) there is only so much we can help you without knowing the reading.