Description

Mitutoyo TM-Series eyepieces (10×, 15×, 20×) swap into Toolmaker’s Microscopes to set viewing comfort and image scale—total magnification = objective × eyepiece, while working distance is set by the objective. 10× gives the widest field and easiest alignment, 15× is the everyday balance of field and detail, and 20× adds extra image scale for tiny features at the cost of a smaller field and tighter eye relief. Choose the lowest power that still shows edges cleanly for general inspection, and step up to 15×/20× for fine radii, burr checks, thread/pitch reads, and other tight-tolerance work.

Product

What it does

176-115 — 10× Eyepiece (TM Series)

Baseline viewing with the widest field and comfortable eye relief. Easiest for quick alignment and for working at lower
objective powers when you want more of the part in view.

Total magnification examples: 2× objective → 20×, 5× → 50×, 10× → 100×
Best for general inspection, layout checks, hole locations, and training
Great with transmitted backlight for silhouettes and edge picking

176-116 — 15× Eyepiece Set (TM Series)

Balanced choice between detail and field of view. Popular “everyday” power for tighter tolerances and cleaner edge reads.
Supplied as a set where paired eyepieces are required (binocular configurations); check your head type.

Total magnification examples: 2× objective → 30×, 5× → 75×, 10× → 150×
Good mix for dimensional work, angle reads with a protractor eyepiece, and general QA
Works well with both transmitted and incident/ring lighting

176-117 — 20× Eyepiece (TM Series)

Higher eyepiece power for very small features when more image scale helps. Expect a smaller field of view and tighter eye relief;
use steady support and even lighting for best results.

Total magnification examples: 2× objective → 40×, 5× → 100×, 10× → 200×
Best for micro-features, small radii, fine burrs, and tight tolerance verification
Pairs nicely with ring light on shiny parts to reduce glare

Notes: Total magnification = objective power × eyepiece power. Choosing a higher eyepiece increases image scale but
typically reduces field of view and eye relief. Working distance is set by the objective, not the eyepiece. Pick the
eyepiece that balances detail vs. field for your parts and operators.