Does it give a code on a failed battery test?

No but it will tell you the battery has failed. I bought two for the the dealership and we use often daily. 100 percent satisfied.

Does this test 4d and 8d batteries as well ?

The MDX-P300 test range is 100 to 1400 CCA so this should cover all 4d and 8d batteries

can this test 24volt?

This model is for up to 12V systems only/ For multiple battery systems and 24V need model Midtronics (MDX-700HD) Battery and Electrical System Analyzer

Does this test for diode ripple in the alternator?

Not this model look at the MDX-740P model for any test on diode failures...

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Midtronics MDX-P300 Battery Starting System Tester Printer Combo CHROME

Product ID: 255788796

Details

Brand
Midtronics
Colour
CHROME
Item weight
907 g
Power source
Battery
Style
Regular

⚡Starts testing from just 1V discharged battery

🔋Tests all battery types (Regular, AGM, Gel)

🖨️Built-in thermal printer powered by vehicle battery

Description

🔋 Power up your diagnostics with precision and print-ready results!

ULTRA LOW VOLTAGE TESTING - Diagnose batteries with as little as 1 volt—no need to charge before testing.
INSTANT BAD CELL DETECTION - Pinpoints failing cells so you know exactly when to replace your battery.
INTEGRATED THERMAL PRINTER - Print professional, on-the-spot test results powered directly by the vehicle battery.
COMPREHENSIVE SYSTEM ANALYSIS - Beyond batteries—tests starting and charging systems for a full vehicle health check.
UNIVERSAL BATTERY COMPATIBILITY - Seamlessly tests Regular, AGM, and Gel batteries for every modern vehicle.

The Midtronics MDX-P300 is a professional-grade battery and starting system tester that supports all major battery types including Regular, AGM, and Gel. It uniquely tests batteries with voltages as low as 1V, detects bad cells instantly, and features a built-in thermal printer powered by the vehicle battery for immediate, on-site reporting. Ideal for automotive pros seeking fast, reliable diagnostics and comprehensive system health checks.

Specifications

ASIN	B000K1OHXK
Best Sellers Rank	#120,426 in Automotive ( See Top 100 in Automotive ) #173 in Automotive Battery Testers
Brand Name	Midtronics
Color	CHROME
Compatible Devices	Vehicles with 12-volt battery and electrical system
Customer Reviews	4.7 4.7 out of 5 stars (92)
Global Trade Identification Number	00675300003008
Included Components	BATTERY STARTING SYSTEM TESTER
Item Dimensions	11.9 x 16.3 x 11.9 centimeters
Item Type Name	Batt_Elect_and_Charging_Testers
Item Weight	2 Pounds
Manufacturer	Midtronics
Maximum Operating Voltage	12 Volts
Measurement Type	Voltmeter
Minimum Operating Voltage	1 Volts (DC)
Model	MDX-P300
Number of Items	1
Number of Packs	1
Part Number	MDX-P300
Power Source	Battery Powered
Specification Met	Iec
Style Name	Regular
UPC	675000003001 045555676362 675300003008
Warranty Description	1 yr warranty on material and workmanship

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