Reddit mentions of Saytay NEW Telephone Phone Line Tester Tool Cable Set with Connectors and Joiner (Blue Ash)

I bought one of these for my kit:

https://amazon.com/Saytay-Telephone-Lineman-Tester-Connectors/dp/B01ABT7458/ref=sr_1_1?ie=UTF8&qid=1469475891&sr=8-1&keywords=Phone+tester

It's worked well the handful of times I've needed it.

This is a selection of what I keep in my tech go-bag. You'll build your kit as you learn and build experience, or realize you could have helped a customer out of a jam quicker if you had that tool with you.

• cheap flashlights you wont feel bad about leaving in a ceiling or inside a rack: https://www.amazon.com/Magnetic-Lights-Super-Bright-White/dp/B00I45JKTA/
  
  
• torx screwdriver for lots of little devices. I have a similar set and it's pretty decent: https://www.amazon.com/Vastar-Magnetic-Precision-Screwdriver-Electronics/dp/B015F734P0/
  
  
• power supply tester
  
  
• rechargable canned air
  
  
• zip ties
  
  
• velcro: https://www.amazon.com/iMBAPrice-Cable-Fastening-Tape-Yards/dp/B00FT2WHO6/
  
  
• leatherman/gerber multi-tool (needlenose) convenient when you need to do something quick and you don't have your bag with you.
  
  
• Set of pliers/wire cutters (leave the chanel locks at home): https://www.amazon.com/Tools-VISE-GRIP-4-Piece-Traditional-2078707/dp/B000CFMCTK/
  
  
• sharpies
  
  
• electrical tape: the good kind not the cheapo stuff
  
  
• multi-screwdriver: https://www.amazon.com/Lenox-Tools-23932-Multi-Tool-Driver/dp/B0013NX2DA/
  
  
• cordless electric screwdriver if you have lots of screwing to do.
  
  
• razor knife: https://www.amazon.com/Gerber-Lite-Pocket-Knife-31-000345/dp/B002RILCLY/
  
  
• cable tester/tone generator: https://www.amazon.com/ELEGIANT-Multifunction-Tracker-Measuring-Instrument/dp/B01HCQSHNG/
  
  
• analog phone for testing phone lines: https://www.amazon.com/Saytay-Telephone-Lineman-Tester-Connectors/dp/B01ABT7458/
  
  
• punch down tool: https://www.amazon.com/TRENDnet-Punch-Krone-Blade-TC-PDT/dp/B0000AZK4D/
  
  
• cable crimper: https://www.amazon.com/TRENDnet-RJ-45-RJ-12-RJ-11-TC-CT68/dp/B0000AZK4G/
  
  Various extra parts I've accumulated over the years like screws, ATX Molex Power to SATA Power Adapters, ATX Molex Y splitters, SATA cables etc..
  
  Good luck and some tools overlap like multi tools and pliers so if budget is low, go with the tool that covers the most jobs.
  
  Edit: I noticed your bag is kind of expensive compared to something like a Dewalt tool bag. I use a plain Dewalt bag which is not as cool as the one in the link, but it's just as tough. This might be a good and less expensive consideration for you if you don't require the look of a briefcase for your tool bag.
  
  Edit 2: You may want to mark your tools with a wrap of some crazy bright color electrical tape to be able to recognize them when they walk away.