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Questions & Answers
Is there a max speed it’s capable of reading? Expert Answer

Unfortunately, the manufacturer has not specified the max speed display. I suggest reaching out to them directly to request the information. I apologize for the inconvenience.

by Bethany Kopel, Gear Expert, February 4, 2021
I reload shotgun shells usually #7.5 lead shot, of course a wad. I want to confirm that this chrono will read shot (as opposed to a single projectile) Manufacturer Answer

Yes, the ProChrono will register shotgun shells. It is recommended to use a distance of 5 feet between the muzzle and the chrono.

by Competition Electronics, Manufacturer, December 11, 2024
Customer Reviews
Helpful Positive Review
I have an F-1 Master Chrony. It drops shots all the time. It can't be connected to a phone or PC. It has 3-piece diffusers instead of solid ones. It's not wireless. It has no audio. Getting data out of it is nearly impossible. You can get a few thing...
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8/8 found this helpful
Helpful Positive Review
Some difficulties but works great. by Wayne, Verified Owner, November 29, 2024
The ProChrono I received was missing the shields when it arrived. A call to Optics Planet took care of that. They contacted Competition Electronics and the shields showed up shortly. A representative from Optics Planet contacted me a little later ...
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3/3 found this helpful
Helpful Positive Review
ProChrono DLX Bluetooth by K1, Verified Owner, October 2, 2024
The ProChrono DLX Bluetooth is an accurate chronograph with Bluetooth connectivity for easy shot data tracking via a mobile app. It’s simple to use, reliable, and great for reloaders. Definitely recommend this product!
2/2 found this helpful
Helpful Positive Review
easy to use by C H, Verified Owner, October 16, 2024
Easy to set up and easy to use! I figured it’d be more difficult but it really was simple.
2/2 found this helpful
Helpful Positive Review
So far so good. by Reaper, Verified Owner, March 16, 2025
First time out with 338 Lapua hand loads. Shot two strings of eight rounds, the chronograph measured every round. The android app worked perfectly and the voice called out all the velocities. All the functions of chronograph worked as intended. I am ...
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1/1 found this helpful
Helpful Positive Review
Chronograph for ballistics - Geek by Tread, Verified Owner, March 21, 2025
received in about 5 days / opened / installed one 9V battery (Super feature: place for a spare battery - sounds simple but a great design) Turned on Bluetooth picked up immediately to tablet / voice readout first shot Screwed onto camera tripod . T...
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1/1 found this helpful
Read All 56 Reviews
Battery Type: Alkaline Run Time: 20 hours Additional Features: Bluetooth BT2 and BT4LE Accuracy: +/- 0.5 ydsWeight: 2.1 lbCondition: New

Code: 2PI-CRO-CEPCDLX-CEI-3820

MPN: CEI-3820

UPC: 787735038200

List: $164.95Save $2.46
$162.49
Receive $3.25 OP Bucks

Product Info for Competition Electronics ProChrono DLX with Bluetooth

The next generation of our ProChrono model based on a time proven design that has been measuring almost anything that shoots since 1985! Great for firearms, shotguns, archery, airguns, and paintball. Everything is included for outdoor use. For indoor use, we recommend our optional Indoor Lighting System (part# CEI-4100). Requires one 9 volt alkaline battery for operation (not included).image

Specifications for Competition Electronics ProChrono DLX with Bluetooth:

Manufacturer: Competition Electronics
Battery Type: Alkaline
Run Time: 20 hours
Additional Features: Bluetooth BT2 and BT4LE
Accuracy: +/- 0.5 yds
Weight: 2.1 lb
Condition: New

Features of Competition Electronics ProChrono DLX with Bluetooth:

  • Velocity Range: 20 - 9,999 feet per second
  • Size: 16x4x3-1/4 inches
  • Current Consumption: Approx. 20mA
  • Guide Wire Size: 3/16x16 inches
  • Minimum Time Between Shots: 500 mSec
  • Accuracy: +/-.5% of measured velocity or better
  • Temperature Range: 20-100 degrees Fahrenheit
  • Mounting Hole Thread: 1/4x20
  • Memory Capacity: Up to 9 strings of up to 99 shots each
  • Shot Timing Resolution: 31 nSec (8000 counts @ 4,000fps) Crystal Controlled
  • Bluetooth: BT2 and BT4LE
  • On-board Bluetooth connectivity
  • and more options with FREE apps for iOS
  • Android
  • Kindle
  • PC
  • and Mac
  • Internal and external refinements with updates to the circuitry and enclosure design
  • Built in full featured operating system with multiple shot string memory and statistics
  • Sensing system compatible with a wide variety of light conditions and projectiles
  • Faster internal shot clock for improved accuracy to +/- .5% or better
  • 2 year warrantee against defects in material and workmanship
  • and a 1/2 price repair guarantee
  • Over 30 years of experience in chronograph design and manufacturing
  • Replaceable Alkaline 9 volt battery power (not included) for 20+ hours of operation
  • Quality accessories and replacement parts at a reasonable price

Package Contents:

  • Competition Electronics ProChrono DLX with Bluetooth

Competition Electronics ProChrono DLX with Bluetooth Orderable Models

List of Orderable Models

  • Competition Electronics ProChrono DLX w/Bluetooth, 9 Volt Battery, Gray, CEI-3820 , MPN: CEI-3820 , UPC: 787735038200 , Code: 2PI-CRO-CEPCDLX-CEI-3820

Competition Electronics ProChrono DLX with Bluetooth Unavailable & Discontinued Models

List of Unorderable Models

  • USED Competition Electronics ProChrono DLX w/Bluetooth, 9 Volt Battery, Gray, CEI-3820, EDEMO9, Used, Condition Like New , MPN: CEI-3820-EDEMO9 , Code: 2PI-CRO-CEPCDLX-CEI-3820-EDEMO9
  • USED, Competition Electronics ProChrono DLX w/Bluetooth, 9 Volt Battery, Gray, CEI-3820 , MPN: CEI-3820-EDEMO , Code: 2PI-CRO-CEPCDLX-CEI-3820-EDEMO-OT-U
  • USED, Competition Electronics ProChrono DLX w/Bluetooth, 9 Volt Battery, Gray, CEI-3820 , MPN: CEI-3820-EDEMO , Code: 2PI-CRO-CEPCDLX-CEI-3820-EDEMO-DF-F
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