Photometric vs Radar Launch Monitors
The technology decides the purchase: cameras measure the strike, radar measures the flight. Photometric units photograph the ball at impact, so they're at their best in a fixed indoor bay where the ball only flies a few feet. Doppler radar tracks the real trajectory, so it's at its best outdoors with a full flight to measure. Pick the technology that matches where you'll actually hit balls, then pick the unit — indoors, that points to a photometric unit like the SkyTrak ST MAX; at the range, to a radar unit like the Garmin Approach R10.
What each technology actually measures
A photometric unit's high-speed cameras capture the ball right at launch and read ball speed, launch angle, launch direction, and spin directly from the images — the flight that follows is computed from those measured inputs. A Doppler radar unit watches the ball move and measures the trajectory itself: with a long real flight it directly measures a large share of the shot, but stopped short by a net it has to calculate the rest. Which numbers a given unit measures versus models is exactly what our Data Points Index documents per device, from manufacturer sources.
| Feature | Photometric (camera) | Doppler radar |
|---|---|---|
| What it measures | Ball at impact, from images | Ball in flight, the trajectory itself |
| Best venue | Fixed indoor bay | Range / outdoors |
| Space it needs | Tight bays fine — ball can stop at a net | Setback behind the ball + flight room |
| Indoor accuracy | Strong — nothing is lost at the net | Softer — more of the shot is modeled |
| Outdoor accuracy | Fine, but bay units are built to stay put | Strongest — true flight measured |
| Typical units | SkyTrak ST MAX, ST+ | Garmin R10, Swing Caddie SC4/SC300i |
So which should you buy?
Hitting mostly indoors into a net? Photometric — the home-simulator pick is the SkyTrak ST MAX class of unit, built for exactly that bay. Hitting mostly at the range? Radar — the outdoor pick is the Garmin Approach R10, whose free core data and pocket size make it the default. Genuinely both? The Rapsodo MLM2PRO's dual-camera-plus-radar design behaves well in tight indoor spaces and still travels; its full data set, including measured spin, requires the Premium membership, so weigh that recurring cost against the R10's free numbers.
The three units that define the choice
- SkyTrak ST MAX — the photometric bay unit; ball data measured by camera, made for a fixed indoor setup. Not ready today? Adding it to your cart keeps your pick saved.
- Garmin Approach R10 — the portable radar default; free core data, happiest with real flight to track. Watch out: needs its setback space behind the ball.
- Rapsodo MLM2PRO — the hybrid; cameras for ball data, radar for club data, measured spin behind the membership. Watch out: budget for the recurring cost.
Complete your setup
Golf Hitting Net
A tensioned net stops full-speed shots in a garage bay so your launch monitor has somewhere safe to hit into.
Shop on Amazon →Golf Practice Hitting Mat
A dense mat protects your clubface and simulates real turf interaction — most sub-$1,000 monitors need one underfoot.
Shop on Amazon →Tablet/Phone Tripod Mount
Most launch monitor apps run on a tablet or phone — a stable mount keeps the screen visible mid-swing without you holding it.
Shop on Amazon →Alignment Sticks
Cheap and essential for checking swing path and setup alignment alongside your launch monitor's numbers.
Shop on Amazon →Range Practice Balls (Bulk)
Hitting into a net repeatedly wears balls down — a bulk bucket of range balls keeps sessions going without gaps.
Shop on Amazon →Frequently Asked Questions
A photometric launch monitor uses high-speed cameras to photograph the ball at and just after impact, measuring ball data — speed, launch angles, spin — directly from those images. A Doppler radar launch monitor tracks the ball through its flight and measures the trajectory as it happens. Cameras measure the strike; radar measures the flight.
Photometric. Camera units capture everything they need in the first moments after impact, so a ball flying a few feet into a net costs them nothing. Radar indoors only sees that short flight and must calculate the rest, which is where its accuracy can soften. That's why fixed indoor bays favor photometric units like the SkyTrak ST MAX while ranges favor radar.
Outdoors flips the logic. With a full real ball flight to track, Doppler radar measures a large sample of true flight data directly — its indoor weakness disappears. Portable radar units like the Garmin Approach R10 are also built for the range in a way fixed camera bays aren't: pocket-sized, battery-powered, and set up in about a minute.
Related guides
- Best launch monitor for a home simulator
- Best launch monitor for outdoor use
- The Data Points Index — measured vs calculated metrics, sourced
Last updated: August 15, 2026.