Timemore Scale Manual: Complete Guide to Setup, Modes, and Calibration

The Timemore Black Mirror scale is one of the most popular coffee scales out there, but the manual that comes with it is thin, vague, and sometimes poorly translated. If you're staring at your new Timemore scale trying to figure out what each mode does and how to set it up, I've got you covered.

I've been using a Timemore Black Mirror as my daily brewing scale for about three years. I'll walk you through initial setup, all the operating modes, calibration, and the little quirks that the manual doesn't mention.

Initial Setup and Power

Charging

The Timemore Black Mirror has a built-in rechargeable battery. Charge it using the included USB-C cable (older models use micro-USB). A full charge takes about 2 to 3 hours, and the battery lasts roughly 8 to 10 hours of active use.

The LED on the side glows red while charging and turns off when full. I charge mine once a week, usually on Sunday evening. If you use it only for morning coffee, you can easily go 10 days between charges.

Turning On and Off

Press and hold the power button for 2 seconds to turn it on. The display shows "0.0" when ready. Press and hold for 2 seconds again to turn it off.

The scale has an auto-off feature that activates after about 3 minutes of inactivity. This saves battery but can be annoying during slow pour over brewing. I'll explain how to work around that in the modes section.

Units

The Timemore defaults to grams and displays to 0.1g precision. That's accurate enough for coffee dosing. Some versions support ounces, but grams are the standard for coffee brewing. Stick with grams.

Understanding the Modes

The Timemore Black Mirror has multiple modes, and switching between them is where most confusion happens. You cycle through modes by tapping the mode button (the smaller button) while the scale is on.

Mode 1: Basic Weighing

This is the default mode. The display shows weight only. No timer. Simple.

Use this for: - Weighing beans before grinding - Measuring water for a kettle - General kitchen weighing

Tap the power button briefly to tare (zero) the scale at any time.

Mode 2: Timer + Weight (Manual Start)

This mode shows both weight and a timer on the display. The timer starts when you press the start/stop button manually.

Use this for: - French press (start timer when you add water, stop at 4 minutes) - Any method where you want to control when timing begins

This is my preferred mode for French press and AeroPress.

Mode 3: Auto-Timer

This is the mode most pour over brewers want. The timer automatically starts when it detects weight change (meaning when water first hits the coffee). You don't have to press anything.

The sensitivity is good. Even a slow initial pour triggers the timer within about half a second. The auto-off feature is also disabled in this mode, so the scale won't shut down mid-brew.

I use this mode for V60 and Chemex. It keeps my hands free for the kettle, and I can glance at both weight and time simultaneously.

Mode 4: Espresso Mode (Some Models)

The Timemore Black Mirror Plus and newer models include an espresso mode. This mode has a faster response time (the display updates more quickly) and starts the timer when it detects the first drops hitting the cup.

If your model doesn't have this mode, you'll simply cycle back to Mode 1 after Mode 3.

Taring and Zeroing

Taring is the most-used function on any coffee scale. A brief tap on the power button zeros the display, regardless of what's sitting on the scale.

My typical workflow:

  1. Place empty brewing vessel on scale. Tare.
  2. Add coffee grounds. Note the weight.
  3. Tare again.
  4. Start pouring water. The display now shows only the water weight.

One quirk: after taring, the Timemore takes about half a second to stabilize at 0.0. If you start pouring immediately after taring, the first reading might be slightly off. I always wait for the display to settle before I pour.

Taring Under Load

The Timemore handles tare under load well up to about 1.5kg. Beyond that, accuracy can drift slightly. For most coffee brewing (where total weight is under 500g), this is never an issue.

Calibration

The Timemore comes factory calibrated, and most users never need to recalibrate. But if your readings seem off (I noticed mine was 0.2g low after about two years), you can calibrate it.

How to Calibrate

  1. Turn off the scale.
  2. Press and hold both buttons simultaneously for about 5 seconds until the display shows "CAL."
  3. Remove everything from the scale surface.
  4. When the display shows "0.0" or a target weight, place a known calibration weight on the scale. A 100g calibration weight works well. You can buy these cheaply online.
  5. Wait for the display to confirm. It will flash or show "PASS."
  6. The scale returns to normal mode, now calibrated.

If you don't have a calibration weight, a stack of U.S. Nickels works in a pinch. Each nickel weighs exactly 5 grams. Twenty nickels give you 100g.

Tips and Tricks from Daily Use

Dealing with Heat

If you place a hot brewer directly on the Timemore, the heat can affect the load cell and cause the reading to drift. I always use a small silicone mat or coaster between my V60 and the scale. This also protects the scale's surface from scratches.

Handling the Auto-Off

In basic weighing mode, the 3-minute auto-off can shut down your scale while you're slowly dialing in a grinder. If this bothers you, switch to Mode 3 (auto-timer mode) even if you don't need the timer. The auto-off is disabled in that mode.

Wind and Airflow

The Timemore is sensitive enough that a ceiling fan or air conditioning vent can cause the reading to fluctuate by 0.1 to 0.2 grams. If you're getting unstable readings, check for drafts.

Surface Matters

Always use the Timemore on a flat, hard surface. Soft surfaces like a towel or silicone mat (under the scale, not on top) can absorb weight and give inaccurate readings. I keep mine on the bare countertop.

If you're looking for a manual grinder to pair with your scale for precise pour over brewing, check out our guides on the best manual coffee grinder and best manual grinder for options that complement a weighing-focused workflow.

Troubleshooting Common Issues

Display Shows "Lo"

Your battery is low. Charge the scale. It still works for a few minutes after showing "Lo," but the readings may become less stable.

Weight Keeps Drifting

This usually means the scale needs recalibration, or the surface is uneven. Try moving it to a different spot on your counter. If it still drifts, recalibrate using the steps above.

Timer Won't Auto-Start

Make sure you're in Mode 3 (auto-timer). In Mode 2, the timer only starts manually. Also check that the scale is tared to 0.0 before you begin. If the display shows a residual weight, the auto-start may not trigger correctly.

Scale Won't Turn On

Hold the power button for a full 3 seconds, not just a quick tap. If nothing happens, plug it into a charger. Some units need a brief charge before they'll power on if the battery is fully depleted.

FAQ

How accurate is the Timemore Black Mirror?

It's accurate to plus or minus 0.1 grams under normal conditions. For coffee dosing, that's more than sufficient. Laboratory-grade scales are accurate to 0.01g, but that level of precision isn't needed for brewing.

Can I use the Timemore scale for espresso?

Yes, though the standard Black Mirror has a slightly slower response time than dedicated espresso scales. The Black Mirror Plus and Basic Plus models have a faster refresh rate that's better for tracking espresso flow in real time. For pulling shots, the quicker display update makes a difference.

How long does the battery last?

About 8 to 10 hours of continuous active use. In practice, with intermittent use (a few brews per day), a single charge lasts me about 7 to 10 days.

Is the Timemore scale waterproof?

No. The surface is water-resistant and handles splashes fine, but don't submerge it or let water pool around the buttons. I wipe mine down with a damp cloth after each use and keep it dry otherwise.

Quick Reference Card

If you want a cheat sheet to stick on your fridge:

  • On/Off: Hold power button 2 seconds
  • Tare: Quick tap on power button
  • Switch modes: Tap mode button
  • Mode 1: Weight only
  • Mode 2: Weight + manual timer
  • Mode 3: Weight + auto timer (best for pour over)
  • Calibrate: Hold both buttons 5 seconds while off

That covers everything the manual should have told you in the first place.