What’s up BoomScootBudz, the testing meter you have can work. TDS is total dissolved solids, basically letting you know the amount of nutrients in your medium. I use the EC value and PPMs. The mode button should let you toggle through to both of those. That 1382 EC is 1.382 and typically a good reading around week 2 of veg, PPM value should be in the range of 650 using the 500 scale. 
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Your tap water is good with those ppm readings. Calmag will elevate the PPMs by 75-100 depending on how much you use. For raising PPM adding nutes or PH down or up or supplemental nutes will raise that. I would check the nutrient schedule against the plant age and adjust accordingly. Remembering to reduce the amount unless it’s Jacks 321. Your last 2 weeks will be flush time with straight PH water, I alternate Molasses with my flushes, not sure they take a lot in but my last harvest had a sweeter taste . @PurpNGold74 is giving you some solid advice.
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I have been using plastic tubettes for my Base A and Base B and probably some of the other nutrients. These tubettes have measurements of what I thought was 5, 10, 15, 20, 25, 30.
Just realized earlier this week that there is a tiny dot between the numbers so I have been under feeding the shit out of all my attempted plants since april. What I thought was 6 or 7 ml was actually .6 or .7! All the drugs finally caught up lmao:purple_heart:
Sidenote: started daily flush yesterday, Big Bud auto gets 1 gallon distilled water : 8mL sweet n sticky from humboldts secret supply everyday for 4-7 days then I will skip flushing 2-3 days before harvest. Trichomes are covering her, but mostly clear still, ~10% have gone cloudy but no amber yet.
Got my 2.3’² mars hydro tent for drying set up. Small circulating fan laying on bottom blowing air up on low
Uvc light will flip on for a few seconds… what y’all think… every 4-6 or every 12 hours
