Amazon Save For Later Changed My Shoe Size

I recently added a pair of boots to my Amazon cart, size 11, but I wasn't quite ready to buy.  Then my daughter asked me to order a clothes drying rack, so I had to click "Save for later" on the boots to move them temporarily out of the cart.  A few days later, I had read enough reviews on the boots, and decided it was time to place the order.  I found the boots in the "Saved for later" section of my Amazon cart, and clicked "Move to Cart" (no idea why "Cart" is capitalized but "later" is not, but semantic inconsistencies were not related to the issue anyway).

I placed the order, assuming that if I selected size 11 when I added the boots to the cart, the item I was ordering would still be size 11 after "Saving for later" and "Moving to Cart."  A few days later, I received a pair of size 10 boots.  My first thought was, "bummer, how could I have messed that up?"  The more I thought about it, the more I convinced I became that it wasn't my mistake at all.  I haven't been able to cram my size 10.5-11 foot into a size 10 shoe since it was still actually a size 10, which was maybe my sophomore year of high-school (i.e. a REALLY long time ago).  I would never, ever select a size 10 shoe, under any circumstances.

So, out of curiosity, I started looking for the reason I ended up with size 10 boots, and another chore on my list to return/exchange the boots with Amazon.  I opened a new browser window, where I wasn't even logged into Amazon, and navigated to the product page for the boots.  The screen starts with a drop down box pre-set to "Select" which forces a choice from the other options (7, 8, 9, 10, 11, etc.).  If I chose anything from that list, it would have been 11, not 10.  So, maybe I mistakenly clicked the wrong option.  Maybe I'm also blind and couldn't see what I had clicked.  Maybe I also didn't notice the incorrect size after clicking "Add to Cart" (which becomes part of the item title).  By the way, now I'm starting to think Amazon's interpretation of the word "Cart" characterizes it as a formal noun.  Perhaps the website designer has a friend who is also named "Cart."

I really wish there were a way to tell Amazon they have a bug in their website, but the reality is, they could not care any less, unless it is a security vulnerability.   So, how do I know it's a bug?  I have this (maybe bad) habit of leaving dozens, perhaps sometimes hundreds, of browser tabs open.  I get interrupted by family members, random thoughts, reminders on my phone, barking dogs, overheard nearby conversations, and probably all sorts of other things. So I open a new tab, leaving the current one open, whenever I decide the interruption requires some info I might find on the web.  I happen to have left the tab open on my Amazon.com cart, from when I first added those boots (before "Saving for later" or "Moving to Cart").  The size, 11, was clearly shown at the end of the cart-item's title.  Now I'm reasonably sure I did what I thought I would have done... picked my own correct shoe size.

If you spent the time to read this, I hope you get the time back someday soon when/if something you added to your Amazon cart... sorry "Cart"..., then moved to "Saved for later" and then moved back to your cart, gets resized, color-changed, or some other selection shifts without notice.  If you're paying just a bit closer attention, and get things corrected before placing the order, maybe it'll save you the hassle of shipping something back.  At the very least, maybe this confirms that you might not have made a mistake, or you might not actually be losing your memory (yet).

I haven't been able to get Amazon's "Cart" + "Save for later" feature to fail in the same way again, and I don't intend to spend any more time on it.  If you notice this happening, and have a set of steps to make it happen, leave a comment.  I'd like to know if anyone else has tripped over this annoying little quirk.

PZEM-051 DC Digital Multi-Function Meter - Instruction Manual

The instructions for this device are not only hard to find online, but even if you do find them, they're not very clear.  This blog post is meant as an attempt to remedy both issues.

Note: To find and download the original instructions, it may be useful to search for PZME_051.pdf (instead of PZEM-051).

Features

The PZEM-051 has the following functions.

• Default "Always On" Display includes these 4 values
• Source Voltage - used to determine the charge level of  a battery
• Amperage Draw - used to determine the rate at which power is being drawn
• "Power" - wattage being drawn 
• Note: This could be calculated from Amps * Volts, but this saves doing the math in your head
• "Energy" - watt-hours drawn since reset - used to determine how much a battery has been discharged (compare with the amp-hours of the battery
• displayed in Wh until 10000 Wh is reached
• displayed in kWh above 10000 Wh
• counter value is kept in memory and persists across power cycles until explicitly reset/cleared (i.e. When the PZEM-051 is disconnected and then reconnected to voltage, the accumulated value of "energy" will continue where it left off.)
• Backlight
• can be toggled on or off
• The backlight state is kept in memory and persists across power-cycles (i.e. When the PZEM-051 is disconnected and then reconnected to voltage, the backlight will return to the same state it was in previously.)

• High and Low Voltage Alarms - 
• flashes the display/backlight
• Note: This is not an audible alarm
• can be customized to match the source battery.
• will flash the backlight when the actual voltage is not within range

Button Functions

• Backlight Toggle
• Each short click turns the backlight on or off
• Voltage Alarm Settings
• Click and hold until SEt appears in the display
• Each digit of the high and low voltage values will blink in turn
• If the value of a digit is not changed for 3 seconds, the blinking digit will automatically switch to the next digit in sequence
• Each short click in this mode will increase the value of the blinking digit, wrapping from 9 back to 0 (zero)
• Each alarm threshhold may be set to a value from 6.5V up to 99.90V
• Values less than 10.0 must have the first digit set to zero (e.g. 09.5)
• Important: The high voltage alarm threshold is on the left side, and the low voltage alarm threshold is on the right side (reversed from low-to-high, left-to-right)
• To store the new settings, click and hold again until PASS appears briefly on the display
• Note: If the high and low alarm thresholds are set backwards, the display will show "Err uAL" briefly, and the new values will be rejected (i.e. the previous values will be retained).
• Clear/Reset the counter/accumulated-value for Energy (watt-hours)
• Click and hold until CLr appears in the display, and the "Energy" counter value begins blinking.
• Note: SEt will appear first - continue holding until CLr appears
• A short click while in this mode will reset the "Energy" value to 0Wh (zero watt-hours)
• Adjust the type of Current Shunt
• Click and hold until Curr appears in the display
• Note: SEt will appear first, then CLr - continue holding until Curr appears
• Note: This should be preset to the type of shunt that was bundled with the PZEM-051, but can be switched to one of two types.  
• Each short click in this mode will toggle between
• 100A - for the 100A/75mV shunt
• 50A - for the 50A/75mV shunt