Regulating an NH Movement: 10 Minutes to Better Accuracy

You Can Improve Accuracy Without a Watchmaker

The most common complaint about NH movements is accuracy: a new build running +25 seconds a day is normal and disappointing. The good news is that most NH calibers can be regulated at home in ten minutes with a steady hand — turning a "meh" movement into a ±5–10 s/day one. This is the first real skill beyond assembly.

Read the Numbers First

1. Measure with a timegrapher or a phone app — trace reading
2. Run the watch in a few positions (dial up, crown up, crown down) — position protocol
3. Find the average; that is what you are regulating against

Target: NH movements typically regulate to ±5–15 s/day with a simple adjustment. Expecting chronometer-level is unrealistic — this is a $30 workhorse.

Where the Regulator Lives

On NH movements, the regulation arm sits near the balance wheel — a small lever with two prongs gripping the hairspring stud. The stud swings on a scale with + and − marks. Moving the lever toward − slows the watch; toward + speeds it up. The scale is coarse; the change per tiny move is visible on a timegrapher almost instantly.

The Regulation Procedure

1. Remove the caseback and rotor — movement in a holder
2. Position the movement so you can see the regulator and the timegrapher reading together
3. Nudge the regulator lever a hair with fine tweezers — a fraction of a millimeter, not a swing
4. Wait 30–60 seconds for the reading to settle, then decide
5. Repeat in small steps — regulation is iterative, not one-shot
6. Reassemble, re-test in two positions, confirm the average improved

What Regulation Cannot Fix

• Large position variance (fast dial-up, slow crown-up) — that is a beat error or balance issue, not regulation
• Erratic daily rates — check the movement's health first (inspection guide)
• Amplitude problems — low amplitude is a power issue, usually needing service

If the trace shows a beat error above ~1.0ms, consider the advanced fix (moving the stud on the balance cock) — worth a watchmaker for your first attempt.

Frequently Asked Questions

Is regulating risky for beginners?
Low risk if you use proper tweezers and move in tiny steps. The danger is slip damage to the hairspring — go slowly, hold the movement steady.

Will regulation void anything?
You are not opening the movement — only moving a lever. It does not affect the parts warranty from most sellers.

Can every NH35 reach ±5 s/day?
Most can get close in their best position; the average across positions is what matters for daily wear.