i own a small engine repair shop will it tell if the coil is misfiring on a single or twin cylinder engine

Yes, it will tell you if the out put voltage is varying. A very useful tool for a small workshop. It senses the voltage indirectly via the spark plug, or a coil lead to a distributor cap.

1. For a car, does this work on only 1 cylinder at a time? 2. Does it have the range so it can this be used in the cockpit while test driving?

1. Only one cylinder at a time, especially if you want to use the ignition condition checking mode.2. The range can be up to about 500mm, depending on interference, on a single cylinder engine such as an outboard or a golf car. however, it needs to be a lot closer for a multi cylinder engine.

will this work to check rpm on small house gen?

First, I bought the TA100 after an extensive search primarily to accurately check idle speed on my 2 & 4 cylinder motorcycles. It works perfectly. There is a setting for single cylinder engines so the answer is "Yes". Very well made with quality hard case.

Does it check for coil resistance output. Could it tell me if the ignition coil is good or bad?

Basically it checks ignition voltages. It will tell you what voltage each spark-plug has before it fires. It will tell you what voltage the ignition coil is putting out. It will give you RPM for any size engine:- chainsaw to V8 etc, but you will need a multimeter to measure resistance. Simple faults like broken coils can be determined by simple test gear. This instrument is for the devious faults. Mark

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GTC TA100 Smartach+ Wireless Ignition Analyzer and Tachometer by General Technologies Corp

Product ID: 2557382

Details

Brand
GTC
Item Weight
1.6 Pounds
Material
Plastic Steel
Number of Items
1
Thread Type
1/4-32 Unf

⚡0-50,000V spark plug voltage range

📊0.05% accuracy on 4.5-digit LCD RPM readout

🔧Works with 1-12 cylinders & multiple engine types

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€ 359.37

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Description

⚡ Tune Like a Pro, Diagnose Like a Boss!

SMART POWER MANAGEMENT - Auto shut-off after idle to save battery life, plus quick reset for carb adjustments on two-stroke engines.
PRECISION RPM MONITORING - Ultra-accurate RPM readings (0.05% error) displayed on a crisp 4.5-digit LCD for flawless tuning.
DURABLE PORTABLE DESIGN - Lightweight, rugged plastic and stainless steel build with a hard padded case—ready for any job site.
INSTANT SPARK DIAGNOSTICS - Quickly identify misfires and faulty spark plugs with a proprietary antenna sensor—no wires, no hassle.
UNIVERSAL ENGINE COMPATIBILITY - Seamlessly works on DIS, conventional, magneto, 2 & 4 cycle engines from 1 to 12 cylinders.

The GTC TA100 Smartach+ is a cutting-edge wireless ignition analyzer and tachometer designed for professional-grade engine diagnostics. Featuring a unique antenna sensor, it measures spark plug voltage up to 50,000 volts and RPMs from 200 to 20,000 with 0.05% accuracy. Compatible with 1 to 12 cylinder engines across DIS, conventional, magneto, and 2/4 cycle systems, it offers quick, wire-free diagnostics in a durable, portable package—perfect for mechanics and enthusiasts who demand precision and efficiency.

Specifications

ASIN	B000RT9BH2
Best Sellers Rank	#396,465 in Automotive ( See Top 100 in Automotive ) #154 in Automotive Tachometers
Brand Name	GTC
Customer Reviews	4.5 4.5 out of 5 stars (155)
Global Trade Identification Number	00833303000190
Included Components	TA100, Rubber Holster, Hard Padded Case, Alkaline Battery, User's Manual
Item Weight	1.55 Pounds
Manufacturer	General Technologies Corp.
Material Type	Plastic, Stainless Steel
Model	TA100
Part Number	TA100
Thread Style	1/4-32 Unf
UPC	833303000190 013317021576 999993048475
Warranty Description	1 YEAR, EXCLUDING BATTERIES

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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