---
title: "Plumb Bob — $283K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/plumb-bob"
last_updated: "2026-08-06T09:20:21.577Z"
locale: en
meta:
description: "Niche score 63/100 · $283K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 63/100 · $283K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Plumb Bob — $283K/yr Amazon US Niche (2026) - Flapen"
---
# **plumb bob**
**Worth a look**
Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 50Growth 31Conversion 61Competition 69Returns 100Price range 76Avg price 92Brand share 60Review moat 74Quality gap 60
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$21.96**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$0.95–$59.81**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****550.82**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Good****44%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Good****5.3%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Good****69%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Market size**
**Good****$283K**
$283K/yr · 245K searches
**Growth**
**Okay****+5.0%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, plumb bob is a $283K/yr Amazon United States market (245K searches/yr). The top 5 brands hold 69% of demand. Verdict: Worth a look — 63/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **plumb bob market data**
- **Units sold / yr**
- **15K–20K**
- avg 750–1,000/product
- **Revenue / yr**
- **$329K–$439K**
- units × avg price
- **Conversion rate**
- **5.3%**
- **Avg BSR**
- **#18**
- **Page quality**
- **0%**
- **Prime**
- **88%**
- **Sponsored**
- **59%**
- **Out of stock**
- **6.3%**
- **Avg brand age**
- **63 months**
- **Avg seller age**
- **171 days**
## **Competition & brand share**
The top 5 products take 44% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**21 **▲rising
**Sellers**
**667**
**Top-5 brand share**
**69%**
Top 20: 99%
**Top-5 click share**
**44%**
Top 20: 86%
**Open market**
**26%**
- HCCMLOVE26% - Johnson21% - Relaxweex8% - AWF PRO8% - Tajima6% - General Tools5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +5.0% search growth over the last 90 days.
5K3KSpike '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/plumb-bob/trend)
## **Top plumb bob search terms**
- **plumb bob**142K/yr+1.3%4.9% conv. - **plumb bob with string**19K/yr+13.6%5.2% conv. - **plum bob**14K/yr-0.0%4.6% conv. - **plumb**11K/yr+20.9%2.9% conv. - **plumbob**13K/yr+14.5%3.1% conv. - **plumb line**10K/yr+3.5%3.0% conv. - **plum bob tool**10K/yr+15.6%5.7% conv. - **brass plumb bob**5K/yr+51.4%2.8% conv. - **plomada de albail**5K/yr+14.9%1.0% conv. - **plomada**7K/yr-11.1%1.2% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/plumb-bob/search-terms)
## **Top plumb bob products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%3%$8K6%$17K9%$25K12%$34K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**HCCMLOVE Plumb Bob Magnetic -10.7 oz(305g) Plumb Rite With 14.5 ft(4.5m) String Sharpener 2 Pencils Line Reel Used in Construction Can Automatically Stretch the Line and Quickly Stabilize the Plumbob**HCCMLOVE**$22.69**4.7★516 rev](https://www.amazon.com/dp/B08SR7HXZJ) [2**Johnson Level & Tool 08 Steel Hexagonal Plumb Bob 8 oz. Steel Finish 1 Pack***Johnson**$9.40**4.6★351 rev](https://www.amazon.com/dp/B00002N7U7) [3**Plumb Bobs Magnetic - 15 oz(425g) Plumb Rite With 14.5 ft(4.5m) String Sharpener 2 Pencils Carrying Case Line Reel Used in Construction Can Automatically Stretch the Line Quickly Stabilize the Plumbob**HCCMLOVE**$25.15**4.7★516 rev](https://www.amazon.com/dp/B09P6BD4L7) [4**AWF PRO Plumb Bob Kit - 16 oz and 8 oz Solid Brass Plumb Bobs 14 ft Retractable Line Reel with Magnetic Base 2 Pencils Pencil Sharpener Carrying Case**AWF PRO**$45.02**4.5★549 rev](https://www.amazon.com/dp/B074SW83JH) [5**Relaxweex 2 Pcs Hexagon Steel Plumb Bob SAE 1045 8 Ounce Brass Plumb**Relaxweex**$19.12**4.3★48 rev](https://www.amazon.com/dp/B0DMZT23MP)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**2PCS Hexagon Steel Plumb Bob 790-8 8 Ounce Brass Plumb Alloy Steel Building Measuring Hammer Wire Hammer Pendant Metal Building Accessories Crafting Wire Kit**Thrseely**$17.28**12 rev9mo ago](https://www.amazon.com/dp/B0FWRHJ9QX) [**Leriton 8 oz Brass Plumb Bob with Replaceable Steel Tip 20 ft String & Hook 2 Carpenter Pencils & Sharpener Accurate Measuring Plum Bob Tool for Contractors Masons DIY Building Surveying (Hexagonal)**Leriton**$11.42**4 rev10mo ago](https://www.amazon.com/dp/B0FS1ZFJ27) [**4 Pack Hexagon Plumb Bob 8 Ounce Alloy Steel Plumb Bob with 49 Ft String Plumb Bob Tool Plumb Line Kit Suitable for Construction Surveying Metal Construction Accessories**MXOYOXM**$26.14**5 rev11mo ago](https://www.amazon.com/dp/B0FLTFSBFN) [**Relaxweex 1 Pcs Hexagon Steel Plumb Bob SAE 1045 8 Ounce Brass Plumb**Relaxweex**$14.82**48 rev1y ago](https://www.amazon.com/dp/B0FGXT4731) [**Retractable Plumb Bob With 19.7ft String Magnetic Retractable Plumb Bob Construction Tools Automatically Stretch Line Quickly Stabilize Plumb Bob Tool Plumb Bob Reel Retractable**Generic**$7.09**6 rev1y ago](https://www.amazon.com/dp/B0F3NH2D6P)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Johnson Level & Tool 08 Steel Hexagonal Plumb Bob 8 oz. Steel Finish 1 Pack***Johnson**$9.40**4.6★**▲ 192%**](https://www.amazon.com/dp/B00002N7U7) [**2PCS Hexagon Steel Plumb Bob 790-8 8 Ounce Brass Plumb Alloy Steel Building Measuring Hammer Wire Hammer Pendant Metal Building Accessories Crafting Wire Kit**Thrseely**$17.28**4.9★**▲ 174%**](https://www.amazon.com/dp/B0FWRHJ9QX) [**Relaxweex 1 Pcs Hexagon Steel Plumb Bob SAE 1045 8 Ounce Brass Plumb**Relaxweex**$14.82**4.3★**▲ 158%**](https://www.amazon.com/dp/B0FGXT4731) [**Leriton 8 oz Brass Plumb Bob with Replaceable Steel Tip 20 ft String & Hook 2 Carpenter Pencils & Sharpener Accurate Measuring Plum Bob Tool for Contractors Masons DIY Building Surveying (Hexagonal)**Leriton**$11.42**3.9★**▲ 150%**](https://www.amazon.com/dp/B0FS1ZFJ27) [**4 Pack Hexagon Plumb Bob 8 Ounce Alloy Steel Plumb Bob with 49 Ft String Plumb Bob Tool Plumb Line Kit Suitable for Construction Surveying Metal Construction Accessories**MXOYOXM**$26.14**4.8★**▲ 133%**](https://www.amazon.com/dp/B0FLTFSBFN)
**~~View all trending →~~**
## **What buyers say about plumb bob**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Freshness**21%
*“Arrived fresh”*
**Taste-Overall**19%
*“best tasting, sweetest plums I've ever tasted”*
**Quality-Overall**12%
*“I was happy with the quality of these black plums”*
**Value For Money**9%
*“Worth the money”*
**Sweetness**5%
*“the sweetness is balanced”*
**Advertised Vs Actual Product**5%
*“Does It's Job”*
**Ease Of Use**5%
*“Perfectly simple and useful”*
**Flavor**4%
*“the bottom half had perfect flavor”*
**Crispiness**4%
*“Delicious firm and look great”*
**Weight Heavy**3%
*“Its heavy enough to hang straight from the ceiling”*
### **What buyers complain about **
**Hard Feel**16%
*“Hard as a rock”*
**Sour**13%
*“Very sour”*
**Taste-Overall**11%
*“Just not tasty”*
**Quality-Overall**8%
*“not satisfied with tehe quality of this fruit”*
**Size-Overall**7%
*“Large”*
**Stale/Rotten/Spoiled**7%
*“not fresh”*
**Sweetness**5%
*“no flavor not sweet”*
**Flavor**5%
*“Black plums not flavorful”*
**Bitter**5%
*“Bitter”*
**Moist/Dry**4%
*“I was sent pithy, dry plums”*
### **Top return reasons **
**Size-Overall**37%
**Weight Heavy**16%
**Functionality-Overall**10%
**Value For Money**8%
**Defective Material/Parts**6%
**Advertised Vs Actual Product**3%
**Durability**3%
**Rusts/Corrodes**3%
**Quality-Overall**2%
**Ease Of Use**2%
## **Common questions**
- **Is plumb bob profitable to sell on Amazon United States?**
- The niche generates $283K/yr across 34 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +5.0%. Flapen's verdict: Worth a look (63/100).
- **How competitive is the plumb bob niche?**
- 21 brands and 667 sellers compete. The top 5 products take 44% of clicks and top 5 brands hold 69% of demand.
- **What do buyers complain about in plumb bob?**
- Top complaints mined from reviews: Hard Feel, Sour, Taste-Overall. The return rate is 0.0%.
- **When does demand for plumb bob peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the plumb bob niche?**
- Listings span $0.95–$59.81; the average listing price is $21.96 (sweet spot $15–$100). The average incumbent carries 551 reviews — the moat a new listing must climb.
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