Klein ET21 Borescope icon

Klein ET21 Borescope

Klein Tools, Inc.

★ 2.0 (7 ratings)

⬇ 1,000+ downloads

Est. actual: 2,514

Free

Released: Jan 7, 2026

No in-app purchases

No ads

Signals

4 this week · 1 positive · 2 warnings All of this week's signals →

📈Last 7 days +166 installs — 39% slower than the week before (+274) · 18/day since Oct 9
🏆Among Productivity apps top 8% by installs gained this week (814 peers growing)
⭐Rating steady at ★ 2.00 since Oct 9
🛠Updates dormant · updated 309 days ago

Installs since launch

+440 installs · +1 ratings since Oct 9

Update history

V1.3.2 Jan 7, 2026 · seen Oct 24, 2026

v1.3.2 ET21

Only the current version so far — new entries appear as the app ships updates.

Klein ET21 Borescope is a productivity app by Klein Tools, Inc. with 1,000+ downloads (about 2.5K estimated). +166 installs in the last 7 days. Rated 2.0 from 7 ratings. Released Jan 7, 2026. Install growth, rank history, SDKs and ad networks.

From the store listing: “Klein Tools ET21 WiFi Borescope”