How many pieces are in the Crystal Detector?

Crystal Detector contains 104 pieces.

When was the Crystal Detector released?

Crystal Detector was released in 1998.

🏛 Hydronauts

Set #6150

Crystal Detector

Crystal Detector is a charming underwater exploration set.

Before you buy

Who it's for: Beginner build Ideal for younger LEGO fans and collectors of classic themes
Build: 104 pieces · about 1.5 hours Build time is an estimate.
Price: $19.99 list price · 19.2¢ per piece
Availability: Likely retired

★★★☆☆ 3.9 community rating from 25 ratings

Fans appreciate the set's nostalgic value and unique trans-green color scheme, but some find the build relatively simple and the play features limited compared to modern LEGO sets. A solid choice for collectors interested in classic LEGO themes.

$19.99

Best Price

$32.00

📝 Our Take

AI-assisted editorial summary, grounded in our LEGO database and public community discussions. How we use AI

Crystal Detector is a charming underwater exploration set. Released in 1998 as part of the Hydronauts theme, it captures the spirit of deep-sea adventure with its unique trans-green elements and functional design.

This set is perfect for LEGO enthusiasts who appreciate classic themes and imaginative play. The build is straightforward, making it accessible to younger builders, while the unique parts and color scheme appeal to collectors.

Skip this if you're looking for a highly complex build or advanced features. Consider sets from the LEGO City Deep Sea Explorers theme for a more modern underwater experience.

✨ New

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🧱 Building Experience

AI-assisted build estimate, grounded in our LEGO database and public community discussions. How we use AI

🧩

104

Pieces

⏱

1.5h

Estimated Build Time

📊

Beginner

Difficulty

Build Highlights:

Simple and engaging build process
Incorporates Technic elements for functionality
Unique trans-green color scheme
Features a small underwater rover

📈 Investment Analysis

AI-assisted investment analysis, grounded in our LEGO database and public community discussions. How we use AI

↑ Trending up since release

B-

Investment Grade

⏳ Retired

The Crystal Detector set, released in 1998, presents a modest investment opportunity primarily driven by its age, relative rarity, and the nostalgia factor associated with the Hydronauts theme. Its low piece count might limit significant appreciation, but the unique trans-green elements and the complete package (box and instructions) could attract collectors. The set's age means that finding it in pristine condition is increasingly difficult, potentially driving up the price for well-preserved copies. However, the Hydronauts theme isn't as universally popular as some other classic LEGO themes, which could temper potential returns. Investors should focus on acquiring sets in excellent condition with original packaging to maximize potential value.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

⚖ Compare Similar Sets

Neptune Discovery Lab

Aquazone • 397 pcs

$65.00

Compared to modern underwater exploration sets, the Crystal Detector offers a more classic, simplistic building experience. While sets like the LEGO City Deep Sea Explorers offer more advanced building techniques and features, the Crystal Detector provides a nostalgic charm and unique color scheme that appeals to collectors. Its smaller size and lower price point also make it a more accessible option for those new to collecting.

1 Minifigure Included

Hydronaut 1

5 parts

B+

The set includes one Hydronaut minifigure, featuring a classic design with a blue and white suit. While not exceptionally rare, the minifigure is essential for completing a Hydronauts collection.

📦 Parts Inventory

Official piece count: 104
Parts cataloged in this inventory: 54 unique parts, 101 pieces
Minifigures: 1

LEGO counts 104 pieces. This inventory comes from a separate parts catalog and lists 106, including the 5 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

Tile Special 1 x ...

Part #: 2412b 2× Black

Windscreen 6 x 6 ...

Part #: 2418bpr0001 1× Trans-Green

Wedge Plate 3 x 6...

Part #: 2419 2× Light Gray

Bracket 1 x 2 - 1...

Part #: 2436 2× Yellow

Brick Special 1 x...

Part #: 2458 1× Yellow

Plate Special 1 x...

Part #: 2540 1× Black

Tile Special 1 x ...

Part #: 2555 3× Light Gray

Windscreen 4 x 4 ...

Part #: 2620 1× Trans-Green

Brick 2 x 4

Part #: 3001 1× Black

Arm Holder Brick ...

Part #: 30014 2× Black

Brick 1 x 2

Part #: 3004 1× Black

Brick 2 x 10

Part #: 3006 1× Light Gray

Plate Special 6 x...

Part #: 30062 1× Yellow

Brick 1 x 4

Part #: 3010 1× Light Gray

Plate 2 x 4

Part #: 3020 1× Yellow

Cockpit 6 x 6 x 3...

Part #: 30200 1× Black

Plate 2 x 2

Part #: 3022 1× Black

Plate 1 x 2

Part #: 3023 2× Light Gray

Plate 1 x 2

Part #: 3023 2× Yellow

Plate 4 x 12

Part #: 3029 2× Light Gray

Rock 1 x 1 Crysta...

Part #: 30385 1× Chrome Silver

Brick Sloped 45° ...

Part #: 3039 4× Yellow

Tile 2 x 2 with G...

Part #: 3068b 1× Blue

Tile 2 x 2 with A...

Part #: 3068bpr9881 1× Black

Brick Sloped 33° ...

Part #: 3298pr0038 2× Yellow

Turntable 4 x 4 S...

Part #: 3403c01 1× Black

Arm Piece Straigh...

Part #: 3612 4× Black

Brick Sloped Inve...

Part #: 3660 7× Black

Plate 1 x 4

Part #: 3710 1× Light Gray

Technic Axle Pin ...

Part #: 3749 2× Light Gray

Plate 2 x 6

Part #: 3795 2× Light Gray

Arm Piece 90° Tur...

Part #: 412 6× Trans-Green

Arm Grab Jaw Hold...

Part #: 4220 1× Yellow

Arm Grab Jaw

Part #: 4221 2× Black

Box 2 x 2 x 2 [Ho...

Part #: 4345b 1× Trans-Green

Box 2 x 2 x 2 Doo...

Part #: 4346 1× Trans-Green

Plate Special 1 x...

Part #: 4590 1× Black

Plate Special 1 x...

Part #: 4623 1× Yellow

Hinge Tile 1 x 4

Part #: 4625 1× Black

Hose, Pneumatic 4...

Part #: 5102c19 1× Light Gray

Weapon Harpoon [4...

Part #: 57467 2× Chrome Silver

Minifig Footwear ...

Part #: 59275 4× Black

Cone 2 x 2 x 1 2/...

Part #: 6039 2× Yellow

Propeller Housing

Part #: 6040 2× Black

Propeller 3 Blade...

Part #: 6041 3× Trans-Green

Brick Special Oct...

Part #: 6042 2× Yellow

Brick 2 x 4 x 2 w...

Part #: 6061 2× Black

Wheel Hard Plasti...

Part #: 6118 4× Black

Plate Round 1 x 1...

Part #: 6141 2× Trans-Neon Orange

Arm Piece with Pi...

Part #: 6217 1× Black

Brick Special 2 x...

Part #: 6249 2× Dark Gray

Technic Brick 1 x...

Part #: 6541 1× Yellow

Equipment Compass...

Part #: 70001pr0001 1× Black

Dish 2 x 2 x 2/3 ...

Part #: 71128 2× Chrome Silver

Equipment Suction...

Part #: 71594c01 1× Trans-Green

The set is notable for its use of trans-green elements, which are relatively uncommon and desirable for MOC builders looking to create underwater scenes. The inclusion of multiple black slopes and Technic pieces also adds to its versatility.