Password security, hashes and rainbow tables

My attempt at explaining how passwords are stored, how hashes work and why it’s important to use difficult passwords and use different passwords for different websites.

Fluke 8846a 6.5 digit multimeter teardown

I had an opportunity to play with Fluke 8846a. It’s a defective unit so can’t do a proper demo, but here’s a quick teardown and parts list. This multimeter retails for approx 1400 USD. Here’s an overview:

  • 6.5 digit resolution
  • Basic V dc accuracy of up to 0.0024 %
  • Dual display
  • 100 μA to 10 A current range, with up to 100 pA resolution
  • Wide ohms range from 10 Ω to 1 GΩ with up to 10 μΩ resolution
  • 2 x 4 ohms 4-wire measurement technique
  • 8846A also measures capacitance and temperature
  • USB memory drive port (8846A)
  • Fluke 45 and Agilent 34401A emulation
  • Graphical display
  • Trendplot™ paperless recorder mode, statistics, histogram
  • CAT I 1000 V, CAT II 600 V

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Mastech / Extech MS8211D pen type multimeter review

I decided to check out the pen type multimeter by Mastech, model MS8211D. I was pleasantly surprised it did not explode or burn when I tried it on all ranges (except milliamps) while it’s pluggen in into 110 VAC mains. See specs and video review below in the full post.

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Bosch PS31 vs Milwaukee M12 2410-20 3/8 in 10mm cordless drill test

I recently got a hold of new and improved Bosch subcompact 3/8″ drill model PS31. Unlike PS30, it comes with new BAT412 batteries which are based on Samsung SDI 13Q cells (same cells as Milwaukee uses in their M12 line), smaller body and more torque.  The following picture is PS31 (left) with PS30 comparison.

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Senco Fusion FN55AX 18ga cordless nailer in action

ToolHacker got a chance to try out the new Senco nailer. It uses a 18v battery and a unique nitrogen chamber energy storage for firing. The motor winds the piston, compresses the nitrogen and then compressed gas pushed the piston when you pull the trigger. Recovery time is FAST, I’d say about 400-500ms.

Battery is 1.1 Ah, uses A123 cells like Dewalt, has a charge indicator. There is a bump-off-single switch on the gun and depth adjustment as well.

See video in full article.

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Bosch PS50 12V GOP 10.8V-Li Multi-X Oscillating Tool


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Bosch, Dewalt, Makita, Milwaukee, Ryobi, Ridgid, Hilti battery specs


There is a handful of cordless power tool manufacturers out there, hundreds of various types of power tool batteries. Electric motors are the muscles that run power tools, and batteries are the heart of any tool. Battery plays a crucial role when it comes to power and runtime.

As a result of marketing wars and poor engineering, certain manufacturers go great lengths to conceal the specifications of their batteries, preventing consumers from making informed decisions when picking a power tool line.

I decided to dig up as much information as possible around the net, a lot from personal findings (opening up batteries), some from RC enthusiast forums, some from EV (el. vehicle) and EB forums. There is a great variety of cells with different capacity, voltage, maximum discharge current and cycle life.

So here’s my findings about cordless batteries. If you don’t like math and physics, the following text will most likely be a boring read for you. Otherwise, dive in!

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Who makes tools for Sears Craftsman brand?

Ever wondered who manufactures tools for Sears’ Craftsman brand?

Craftsman model number is recorded as xxx.zzzzz, where xxx prefix indicates who actually manufactured the product. The following list is partially outdated. Some codes are assigned to 2 or more manufacturers, some manufacturers have 2 or more codes.See the complete serial number guide to find out:

001 Stevens
002 Lemont Industries
071 Agri-Fab Corp
093 Ametek
101 Atlas Press (now Clausing Industrial)
102 Robert Shaw
102 Walker Turner
103 King Seeley

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Makita BML184 vs Dewalt DC527 18v work lights

With any type of work, you run into a situation where you need an artificial light source. Typical jobsite lighting are halogen lights running off power grid or a handheld   “shop” lights. The drawback is that you have to drag a cord everywhere, can burn yourself with incandescent light and grid power is not always available. This is where cordless lights have a huge advantage.

I got both Makita BML184 and DeWalt DC527 18 volt fluorescent cordless work lights. I was excited to get Makita because of 3.0 Ah batteries,  hoping to get a longer run time thanDC527 with  DeWalt’s 2.4 Ah batteries.

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DeWalt DC390 vs Makita BSS610 18v cordless circular saw

Wanted to compare 2 cordless circular saws I have, which are DeWalt 18 volt DC390 (2.4 A*h XRP NiCd battery) and Makita LXT BSS610, 18 volt (3 A*h Li-ion battery). I charged the batteries and started cutting 1/4 inch slices off a 2×4. DeWalt made 78 cuts before battery died, with first 70 cuts at near-full RPM (3700), full power. I did another test and DeWalt made 75 cuts with first 70 cuts at near full power/RPM. Makita made 73 cuts with first 65 cuts at near full RPM and last 8 at less than half RPM. Second run on Makita yielded 65 cuts with first 60 being full-power.

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