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Extech
Extech 461891 Contact Tachometer
Quote on request
No online payment · add lines to RFQ BOM
Contact tachometer; 0.5–20,000 rpm; ±0.05% rdg. RFQ + selection help.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Accuracy
±(0.05% rdg + 1 digit)
Display
Large 5-digit LCD
Rpm Range
0.5 to 19,999 rpm (contact)
Surface Speed
0.2 to 6,560 ft/min; 0.05 to 1,999.9 m/min
Resolution
0.1 rpm (0.5–999.9 rpm); 1 rpm (>1,000 rpm)
Sampling Time
1 s (>6 rpm)
Fits precision contact speed checks where you need an Extech 461891 covering 0.5–20,000 rpm with ±0.05% of reading class accuracy and surface-speed readout.
Key advantages
- RPM range — 0.5 to 20,000 rpm contact
- Accuracy — ±(0.05% of reading + 1 digit) class
- Surface speed — 0.2–6560 ft/min; 0.05–1999.9 m/min
- Display — 5-digit LCD; ~1 s sampling
- Power — 4× AA
Typical applications
- Shaft and roller rpm checks.
- Surface speed on belts and webs.
- Maintenance tachometry with contact tip.
Selection guide
- Contact vs photo — Needs tip access
- Surface-speed units — ft/min vs m/min
- Resolution — 0.1 rpm below 1000
- Tip condition — Cone/wheel wear
Common mistakes
- Slipping contact tip underestimating rpm.
- Using on inaccessible shafts without photo tach.
- Ignoring tip speed limits on soft surfaces.
When to RFQ / what to tell us
- Tips/wheels; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 25418 |
| Brand | Extech |
| Model | 461891 |
| Product type | Contact Tachometer |
| RPM range | 0.5 to 20,000 rpm (contact) |
| Accuracy | ±(0.05% of reading + 1 digit) |
| Resolution | 0.1 rpm (<1000); 1 rpm (≥1000) |
| Surface speed | 0.2 to 6560 ft/min; 0.05 to 1999.9 m/min |
| Display | 5-digit LCD |
| Sampling time | 1 second typical |
| Power | 4× AA |
| Warranty | 1 year typical OEM class |
Documents
FAQ
Q: RPM range? A: 0.5 to 20,000 rpm (contact).
Q: Accuracy? A: ±(0.05% of reading + 1 digit) class.
Q: What should I send for a quote? A: Accessories, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Accuracy | ±(0.05% rdg + 1 digit) |
| Display | Large 5-digit LCD |
| Rpm Range | 0.5 to 19,999 rpm (contact) |
| Surface Speed | 0.2 to 6,560 ft/min; 0.05 to 1,999.9 m/min |
| Resolution | 0.1 rpm (0.5–999.9 rpm); 1 rpm (>1,000 rpm) |
| Sampling Time | 1 s (>6 rpm) |
| Memory | Last MAX/MIN value recall |
| Measurement Mode | Contact tip on rotating object; accessory wheels for linear surface speed |
| Power | 4 × 1.5 V AA batteries |
| Dimensions | 6.7 × 2.8 × 1.5 in (170 × 27 × 37 mm) |
| Weight | 9.2 oz (260 g) |
| Autoranging | Yes |