Are these sensitive enough to detect the spark on a Briggs & Stratton 3.5hp lawnmower engine?

All spark plugs require a very high voltage, usually 15kv +. I would assume that even a small B&S engine requires the same.

Does the top unscrew to fit motorcycle spark plug caps (usually only fit the screw at the top of the spark plug)?

Regret no - no sign that the terminal tops unscrew. Stepehen Kiefer

Would these work on my positive earth classic car?

I assume it will, if is a primary DC +/- which operates the coil and will normally function either way round for Pos. or Neg. cars.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Laser 2780 Ht Lead Ignition Spark Tester, Red

Product ID: 48002328

Details

Brand
Laser
Colour
Red
Item weight
0.08 Kilograms
Power source
Battery
Style
Classic

⚡4 HT lead testers for multi-vehicle diagnostics

🌍RoHS compliant for eco-conscious pros

🔧Connects seamlessly between spark plug & HT lead

Bs.769

Duties & taxes included

In stock

Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Spark your engine diagnostics into the fast lane!

COMPACT LIGHTWEIGHT - At just 0.08 kg and sleek dimensions, it’s built for on-the-go pros.
UNIVERSAL COMPATIBILITY - Effortlessly fits spark plugs and HT leads across diverse vehicle models.
ECO FRIENDLY ENGINEERING - RoHS compliance ensures your toolkit stays green and professional.
TRUSTED QUALITY SUPPORT - Backed by a 12-month warranty and stellar 4.5-star user approval.
PRECISION IGNITION DIAGNOSTICS - Pinpoint ignition faults fast with 4 dedicated HT lead testers.

The Laser 2780 HT Lead Ignition Spark Tester is a compact, battery-powered diagnostic tool designed to test ignition output by connecting between spark plugs and HT leads. Featuring 4 testers in one, it offers versatile compatibility with various vehicles, is RoHS compliant, and comes with a 12-month warranty, making it a reliable choice for professional mechanics and automotive enthusiasts.

Specifications

ASIN	B003AN1VPW
Best Sellers Rank	11,783 in Automotive ( See Top 100 in Automotive ) 4 in Ignition Testers
Brand	Laser
Colour	Red
Compatible Devices	Spark plugs and HT leads of various vehicles
Country Of Origin	Taiwan
Customer Reviews	4.5 4.5 out of 5 stars (357)
Global Trade Identification Number	05018341027803
Included Components	4 testers
Item Dimensions	22 x 110 x 169 millimetres
Item Type Name	Laser Tools HT Lead Ignition Spark Tester
Item Weight	0.08 Kilograms
Manufacturer	Tool Connection (EU)
Manufacturer Part Number	2780
Measurement Type	Multimeter
Model Number	2780
Number of Items	1
Power Source	Battery Powered
Product Warranty	12 Months
Style Name	Classic

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