Optimate test – cranking & alternator, TS-121, 12V tester for battery state of charge, cranking performance and vehicle charging system
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Optimate test – cranking & alternator, TS-121, 12V tester for battery state of charge, cranking performance and vehicle charging system

4.4/5
Product ID: 17847170
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Details

  • Brand
    Tecmate
  • Power Source
    Battery
  • Style
    OptiMATE 12V &
  • Item Weight
    0.3 Pounds
  • Item dimensions L x W x H
    10.5 x 4.75 x
Measures cranking & charge voltage simultaneously
🔋12V & 12.8V battery compatibility
⏱️15-second rapid diagnostics

Description

⚡ Diagnose Like a Pro, Charge Ahead with Confidence!

  • POCKET SIZED POWERHOUSE - Compact 10.5 x 4.75 x 1.25 inches design fits in your toolkit for on-the-go diagnostics.
  • EFFORTLESS 3 STEP TESTING - Connect, check state of charge, start engine—get full results in just 15 seconds, saving you valuable time.
  • RELIABLE SAE STANDARD ACCURACY - Engineered to SAE specs ensuring trusted, professional-grade voltage measurements every time.
  • INSTANT CRANKING CHARGING INSIGHT - Simultaneously displays cranking voltage down to 6V and charging voltage up to 15V for precise battery health checks.
  • UNIVERSAL 12 V LI FE PO 4 COMPATIBILITY - Works seamlessly with AGM, GEL, STD lead-acid & LiFePO4 batteries for versatile vehicle coverage.

The Tecmate Optimate TS-121 is a compact, battery-powered 12V tester designed for quick and accurate diagnostics of vehicle starter batteries and alternators. Compatible with lead-acid and LiFePO4 batteries, it delivers simultaneous cranking and charging voltage readings within 15 seconds, empowering professionals and enthusiasts to troubleshoot battery health and charging systems efficiently.

Specifications

BrandTecmate
Power SourceBattery Powered
StyleOptiMATE TESTER: 12V Cranking & Alternator test
Item Weight0.3 Pounds
Item dimensions L x W x H10.5 x 4.75 x 1.25 inches
Min. Operating Voltage6 Volts (DC)
Specification MetSae
Measurement TypeVoltmeter
ManufacturerTecMate
Global Trade Identification Number05425006141864
ModelTS-121
Item Weight4.8 ounces
Product Dimensions10.5 x 4.75 x 1.25 inches
Item model numberTS-121
Is Discontinued By ManufacturerNo
Manufacturer Part NumberTS-121

Reviews

4.4

All from verified purchases

T**N

Easy to use

Bought this to keep in my bike’s toolkit. A day or two after it arrived, my car wouldn’t start. Was able to correctly diagnose that the battery needed to be replaced. It had enough voltage at rest, but dropped too low during cranking.

J**.

Really does what it says it does

Straightforward product, does its job well. One small issue is the cable is not very long. So, for my trunk mounted battery, I cant bring the meter all the way to the dash to see it. I set it on the trunklid and was able to view it in the rear view mirror, reversed, but still understandable. It takes the guesswork out of diagnosing the charging system and battery state.

D**T

Super tool!

Hardly any vehicles these days come with voltmeters that continuously read the battery voltage. Digital voltage readouts are available as aftermarket items and are not difficult to install. But, even if you have an aftermarket digital voltmeter they only hold their readouts for the display update time which is only a fraction of a second. Because the lowest cranking voltage occurs very quickly a digital voltage display won't reliably detect the lowest voltage and hold it the way the Optimate does. THIS IS THE BEST INEXPENSIVE TOOL TO SHOW THE CRANKING VOLTAGE. A thousand-dollar digital storage oscilloscope would be better... but you can't throw one of those into a motorcycle hard case for portable use. Use this tool to check the resting, cranking, and charging voltages occasionally, jot them down in a logbook, and this ONE TOOL will give you an indication of the health of your motorcycle battery, alternator, and starter. If it shows that everything is ok it will provide peace of mind. If it shows your battery, alternator, and starter are dead or dying, it will pay for itself by telling you where to troubleshoot. This tool is recommended by Tracy Martin in his book on Motorcycle Electrical Systems.BTW, I have a 5-year-old Shorai lithium battery in my bike, and this works perfectly with it. My resting volts are in the green (around 13.4 volts) (lithiums are higher than lead-acids), my alternator output voltage is in the green (14.1 volts), and my starting voltage is 8 volts... in the yellow. But everything else is ok and the bike starts just fine, so I'm not worried.

T**R

Less than accurate

Not as accurate as I would have wished for, when tested up against a higher quality commercial grade multi tester the crank voltage was off by 2 volts and the charging system test off by .7 volts. It is probably a good tool if you don't have a higher end multi tester.

J**W

Very Simple

Readings are very fast.

J**N

Awesome little tool

Worked as it should and was able to see if my batteries were too low or charged perfect. Also indicates on the back how healthy your battery is.

L**A

Nice battery/charging system tester

Great tool that has worked well for testing motorcycle batteries and charging systems. My only complaint is the material used for the housing. It feels pretty cheap and I am concerned that it will break in use.

T**N

Small and light

This unit is small in size feels plasticky but solid as it needs be. Worked right out of the box1 once connected shows the status of the battery2 then it shows how good is the battery in terms of cracking power (how good the battery in giving you power trying to start the vehicle) its simply how long you can keep hearing that sound when you push start or turn your key to ignite the engine3 then it shows how good is your alternator charging up the batteryGet this if you have problems starting up your car or bike and don't know why. it will point out for you if you need a new battery or you need to take your car or bike to the mechanic .PsIf it tells you ur battery is bad try a good battery charger (I have the optimate 6) it will really charge it up to tell you to change it and get a new one

Common Questions

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

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

1 day ago

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Optimate Test Cranking And Alternator Ts 121 12v Tester Battery | Desertcart Finland