Stalker Pro IIs
The Pro IIs was Stalker's handheld spin-rate gun, the kind scouts carried for years. It's no longer on Stalker's store, so today it's a used-market buy. Its new replacement is the Stalker Pro 3s.
Discontinued: buy used
Stalker Pro IIs Discontinued
Best for: Buyers shopping used who want spin rate for less than a new Pro 3s
| Accuracy | ±3% of reading |
|---|---|
| Range | 300–500 ft (spin about 150 ft) |
| Speed range | 1–150 mph |
| App / Bluetooth | None listed in the 2019 manual |
| Power | Li-ion battery handle, 5+ hr transmit |
| Warranty | 2 years when new |
No maker price: sold by third-party sellers. Check current price.
What it is
The Pro IIs is a professional handheld Ka-band radar from Stalker (Applied Concepts, Inc. of Texas). Its big feature is spin rate. Stalker's brochure calls the Pro Series the only handheld sports radars that capture spin rate. Beyond that it's a full scouting gun, with:
- peak, rolldown and spin/exit windows
- recall of the last 10 pitches
- a backlit LCD
- an IP67-rated aluminum and magnesium housing
- a rechargeable Li-ion battery handle that Stalker rated for over 5 hours of transmit time
Specs (from Stalker's manual and brochure)
| Spec | Stalker Pro IIs |
|---|---|
| Speed range | 1–150 mph |
| Accuracy | ±3% of reading |
| Velocity range on a baseball | 300–500 ft (unobstructed view) |
| Spin rate range | 200 ft max (manual table); 150 ft (brochure) |
| Band / beam | Ka-band 34.7 GHz, 12° beam |
| Display | Backlit LCD: peak, rolldown, spin/exit windows; last 10 pitches recall |
| Power | 7.4 V, 3.7 Ah Li-ion battery handle; 5+ hr transmit time (brochure) |
| Weight / size | 2.15 lb; 7.35 × 2.83 × 7.9 in |
| Weather | IP67 (1 m for 30 min); −22°F to 158°F operating |
| Warranty (when new) | 2 years |
| Status | No longer on Stalker's store |
Sources: Stalker Pro IIs operator manual 011-0280-00 (2019) and Stalker Pro IIs brochure. Store status checked at stalkersport.com on Oct 24, 2026.
Who it's for
- Scouts and college programs that want spin rate and long range, and don't want to pay new Pro 3s prices.
- Serious pitching instructors who already know what to do with spin data.
- Not for parents. For velocity alone, a Pocket Radar does the job for a fraction of the price.
Its limits
- Discontinued. You lose the warranty, and service and parts depend on Stalker's support.
- Old batteries. Li-ion handles wear out with age. Price a replacement into the deal.
- Heavy for a handheld, at 2.15 lb.
- No modern app like the Sport 3 Connect's.
- Used prices swing a lot. Compare several sold listings before you buy.
Stalker Pro 3s: the current model
Current spin-rate gun
Stalker Pro 3s
Best for: College and pro staffs who want spin rate in a handheld
| Accuracy | ±3% of reading |
|---|---|
| Range | Up to 500 ft (spin up to 150 ft) |
| Speed range | 0–150 mph |
| App / Bluetooth | Yes, iOS (up to 10 devices) |
| Power | Rechargeable, about 5 hr |
| Warranty | 2 years |
$2,899.99 at stalkersport.com (radar only) (checked Oct 24, 2026)
The Pro 3s is Stalker's current handheld with spin rate. Stalker lists faster spin detection, better accuracy from multiple field positions, a 150 ft spin-rate range and a 500 ft velocity range. At stalkersport.com it was $2,899.99 for the gun, $3,799.99 with a 2.5-digit LED speed sign and $3,999.99 with a 3.5-digit sign, checked Oct 24, 2026. The Pro 3 (no spin) was $1,999.99. Stalker charges a 25% restocking fee on returns.
How it compares
| Model | Accuracy | Range | Speed range | App / Bluetooth | Price (maker) |
|---|---|---|---|---|---|
| Stalker Pro IIs | ±3% of reading | 300–500 ft (spin about 150 ft) | 1–150 mph | None listed in the 2019 manual | Discontinued |
| Stalker Pro 3s | ±3% of reading | Up to 500 ft (spin up to 150 ft) | 0–150 mph | Yes, iOS (up to 10 devices) | $2,899.99 |
| Stalker Sport 3 Connect | ±3% of reading | Up to 300 ft | 5–150 mph | Yes, iOS (up to 10 devices) | $799.99 |
 Smart Coach | ±1 mph | Up to 120 ft | 25–130 mph | Yes (iOS 15.8+, Android 10+) | $399.99 |
Specs and prices from each maker's own page or store (or the named retailer), checked Oct 24, 2026. Accuracy figures are the makers' claims. Prices change; we never show Amazon prices.
- vs Stalker Sport 3 Connect: if you don't need spin, the Sport 3 Connect is $799.99 new with a warranty and an app.
- vs Pocket Radar Smart Coach: velocity and exit velo only, but ±1 mph, pocket-size and $399.99.
- vs other used guns: see the used radar gun guide for the Sport 2, Pro II and JUGS models.
Where to buy
Not sure you need spin rate? See every pick in our best baseball radar guns guide →
FAQ
Is the Stalker Pro IIs discontinued?
Yes, as far as we can tell. Stalker's store no longer has a Pro IIs product page, and the Pro 3s is now its handheld spin-rate gun. Pro IIs guns still sell used.
How accurate is the Stalker Pro IIs?
Stalker's 2019 operator manual lists ±3% of reading over 1–150 mph.
How far can the Pro IIs measure spin rate?
The manual's spec table lists a maximum spin-measuring distance of 200 ft; the product brochure says 150 ft. Velocity range on baseballs is listed at 300–500 ft with a clear view.
What's the difference between the Pro IIs and the Pro 3s?
The Pro 3s is the current model. Stalker lists faster spin detection, better accuracy from multiple field positions, 150 ft spin range and a 500 ft velocity range. It's $2,899.99 for the gun at stalkersport.com.
What should I check when buying a used Pro IIs?
Ask for the serial number, a video of it reading a pitch (or a tuning fork) with spin showing, the battery handle's age and whether the charger is included. A tired Li-ion battery handle is the most common weak point on any older gun.
Did Applied Concepts make Stalker guns?
Yes. Applied Concepts, Inc. is the Texas company behind the Stalker brand. Our old Applied Concepts article now points here.