Here are the specs, pros & cons, and buying info for the Tether Tools Rock Solid PowrGrip 3 for Smartphone (RSPG30):
🔧 Specs & Features
| Feature | Detail |
|---|---|
| Model / SKU | RSPG30 — Rock Solid PowrGrip 3 for Smartphone Polyline Corp+2B&H Photo Video+2 |
| Type of Mount | Vacuum suction mount (Wood’s PowrGrip pad) with a ball head assembly for a ¼‑20 mount B&H Photo Video+1 |
| Pad Diameter | 3″ (~76 mm) B&H Photo Video+1 |
| Max Load Capacity | 6 lb (≈ 2.7 kg) B&H Photo Video+1 |
| Thread / Mounting Options | ¼‑20 mounting thread via the ball head, which allows you to attach standard camera / accessory hardware. Polyline Corp+1 |
| Surfaces It Works On | Smooth, non‑porous surfaces: windows, mirrors, car bodies, boats, counters etc. Polyline Corp+2B&H Photo Video+2 |
| Release Mechanism | Has a hand‑actuated pump to create the vacuum, with a red‑line indicator that warns when vacuum is dropping. For release, rubber tabs at the edge can be used. Polyline Corp+1 |
| Other Inclusions | Pad protector for storage, ball head assembly. B&H Photo Video+1 |
👍 Pros / What’s Good
Very strong holding strength for a vacuum mount (6 lb) — allows not just phones but also some small cameras or heavier accessories within that limit. B&H Photo Video+1
Fast to mount & release; the vacuum pump mechanism provides strong adhesion.
Flexible angle adjustment via the ball head. If you have a ¼‑20 compatible arm or adapter, can use that too.
The pad protector helps keep the suction pad clean and unharmed when not in use.
Usually fairly compact, easy to carry for field‑use where you might want to mount a phone or small gear to glass or shiny surfaces etc.
⚠️ Limitations / Things to Be Careful About
The adhesion depends a lot on the smoothness, cleanliness, and non‑porosity of the surface. Dust, grease, or texture can reduce suction strength.
The 6 lb rating is good, but only if the load is well balanced and not offset far out. Long lever arms will stress the mount.
With time, vacuum holds can degrade (slow leaks etc.). The red‑indicator helps, but you’ll need to check occasionally in longer shoots.
Suction pads may wear or degrade, especially if used outdoors, heated glass or extreme temperatures.
For mobile surfaces (e.g. car exteriors, boat hulls), vibrations or movement can cause the mount to fail faster.