Is there any way of replacing or charging the battery when it goes flat?

Not sure,becuse the unit is sealed,it my be the case when in use it gets a charge. You could try finding a chemical that will melt the resin sealant so you can get into it to replace the battery, there is a is a potting compound thinner on the market that electronic companys use to melt down the sealer, try looking on line for potting compound sealers & thinners.

What is the life of the battery?

Don't know, battery is incapsulated. I only used is temporary to set the timing on my Yamaha XVS 1100 Dragstar.

How do you select sparks per revolution?

Push the button on the display bottom right.

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Description

⚡ Track Every Revolution Like a Pro—Stay Ahead of Your Engine’s Game!

MAX RPM MEMORY - Captures and displays peak RPM for 5 seconds after engine shutdown—never miss your engine’s top performance.
BUILT TO ENDURE - Epoxy resin potting ensures IP68 waterproofing plus shock and abrasion resistance for rugged, long-lasting use.
CLIP GO PRECISION - Alligator clip design for effortless, secure spark plug wire connection—start measuring instantly.
READY OUT OF THE BOX - Includes lithium metal battery and screws for quick installation, backed by a 2-year warranty for peace of mind.
TAILORED STROKE MODES - 9 programmable firing patterns adapt to various gasoline engine types for ultra-accurate RPM tracking.

The NInE-ROnG NR-HM019J is a lightweight, waterproof digital tachometer designed for gasoline engines up to 25,000 RPM. Featuring an easy alligator clip connection, 9 programmable stroke modes, and IP68-rated durability, it delivers precise real-time and max RPM readings. Perfect for paramotors, chainsaws, generators, and more, it comes with a lithium metal battery and a 2-year warranty, making it a reliable tool for professionals demanding accuracy and resilience.

Reviews

L**.

Works

Works well good too to have

12.02.2025

A**R

Very good value

Works well saves slot of time

11.06.2020

P**L

does what it says "on the box"

Surprisingly accurate NOTE.... permanently powered up but that is the "nature of the beast"

2.10.2021

R**F

Works perfectly

Works perfectly on my 4 cylinder Yamaha and my 2 cylinder Yamaha.Good buy

26.07.2020

N**L

Ease of use, ability to achieve accurate rpm settings...

quick delivery, used immediately to set engine RPM to manufacturer specification, simple to use giving accurate readings.

15.11.2019

A**R

Great useful tool a must

Accurate works well. Does what is says it will.

4.02.2020

R**Y

Simple, low cost tacho. Hassle free fitting. Usable on a range of engines.

Really simple low cost product. Works via induction. No hardwiring required. Accurate digital display Used it to check a faulty tacho. Useful item to have in your tool kit.

19.12.2022

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RM281

Duties & taxes incl.

Malaysiastore

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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Manufacturer	Jayron
Part Number	JR-HM019J
Batteries	1 Lithium Metal batteries required. (included)
Manufacturer reference	JR-HM019J
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium Metal
Item Weight	20 g

NR-HM019J Digital Tachometer LCD Waterproof Gasoline Engine Inductive Tachometer for Paramotors,Chainsaws,Generators,Mowesr,Model Boats

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