Knowledge Base
Frequently Asked Questions
How do I read a strobe display?
Adjust your instrument until the pattern is as close to still as possible. Strobe displays are 'real-time' and extremely high definition. They require very precise tuning adjustments to stop the display because the frequency/pitch of any instrument is never totally stable.
You'll quickly learn to read the display, make the most precise adjustments and appreciate the high resolution that only a Peterson provides.
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Is the accuracy the same for all Peterson tuners?
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Does my tuner require calibration?
Unlike more modern Peterson strobes, legacy models such as the Peterson 400, 420, 450 and 700 do require occasional calibration.
If you require service, please open a support ticket and return the tuner for repair.
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What is my StroboPLUS HDC’s Sweetened Tunings feature all about?
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Is there a carrying case available?
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Which Peterson products work with Peterson Connect?
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I often tune my acoustic instrument in a loud environment. What's available to help with that?
For instruments with a flat resonating surface, you can use a suction cup tuning pickup to reduce ambient noise interference.
A Peterson TP-3 clip-on tuning pickup is a very versatile device that can be clipped onto any portion of the instrument that vibrates, such as the headstock of a guitar or the bell or lead pipe of a horn.
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How accurate is my StroboPLUS HDC?
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How do I send my product in for repair?
All products returned for service must have a support ticket number on the outside of the box as well as on the accompanying paperwork on the inside of the box. If you have not registered your tuner, you must do so before returning it. Include a description of your problem. Please be specific about the type of malfunction as well as the conditions under which it occurs.
There is a minimum charge of $70.00 US plus a shipping charge for all Peterson tuners received (unless subject to Peterson warranty). Payment options include C.O.D., VISA, MasterCard, and Discover Card.
NOTE: For international (non-USA) repairs and for all Conn tuner repairs, a different procedure may apply. If you would like an advance estimate for service, you must include a request in writing with the tuner you ship.
Contact and Shipping Details:
For service of Peterson tuners:
Peterson Electro-Musical Products, Inc. 11601 South Mayfield Ave. Alsip, IL 60803 USA
TEL: 708-388-3311 (ext. 143) FAX: 708-388-3341
Email: techwest@petersonemp.com
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What should I do if my new Peterson product doesn't seem to work properly?
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What is the range of Hz calibration or Concert A calibration of my StroboPLUS HDC?
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How do I find out how far out of tune my guitar is in cents?
The following video shows this process using a StroboPLUS HD.

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Not finding an answer? Open a support ticket for personalized support of your Peterson product.
Product Manuals
Not finding an answer? Open a support ticket for personalized support of your Peterson product.
Firmware History
StroboPLUS HDC Version 1.0.21
Tuesday, October 18, 2022 2:00:00 PM EDT
- Various Bug Fixes and Improvements
StroboPLUS HDC Version 1.0.20
Friday, April 8, 2022 12:16:00 PM EDT
- Various Bug Fixes and Improvements
StroboPLUS HDC Version 1.0.19
Tuesday, February 22, 2022 11:16:00 AM EST
- Changes how various parameters are adjusted
- Tempo, Concert A, Cents and Timer adjust in whole units rather than tenths
- Holding IN on the encoder while turning increments in tenths
- Holding Parameter Button while turning changes Tempo Beat Value in Metronome Mode
StroboPLUS HDC Version 1.0.18
Friday, February 4, 2022 2:24:00 PM EST
- Fixes auto-off in metronome mode
- Various Bug Fixes and Improvements
StroboPLUS HDC Version 1.0.17
Monday, January 24, 2022 1:24:00 PM EST
- Metronome: Increases allowed number of tempo maps from 10 to 100
- Various Bug Fixes and Improvements
StroboPLUS HDC Version 1.0.16
Wednesday, January 12, 2022 8:00:00 PM EST
- In tuner mode, default auto-off time-out changed from 2 minutes to 10 minutes
- Various Bug Fixes and Improvements
StroboPLUS HDC Version 1.0.15
Wednesday, November 17, 2021 7:48:00 AM EST
- Metronome now supports setting tempo in Eighth notes, Dotted Quarter notes and Half notes rather than ONLY Quarter notes per minute
- Defaults to Dotted Quarter notes per minute when meter is adjusted to 3/8, 6/8, 9/8, 12/8 etc
- Various Bug Fixes & Improvements in addition to updates included in Firmware Version 1.0.14
StroboPLUS HDC Version 1.0.14
Friday, October 1, 2021 11:23:00 AM EDT
- Fixes battery level meter - was showing lower than the actual battery level
- Auto-Power OFF disabled when in Timer Mode
- Additional Accent Patterns in Metronome for 13/x to 17/x meters
- Alternate Accent Pattern selections save with Metronome Preset
- Shows Tempo Map name with Metronome Preset
- Various Bug Fixes and Improvements
StroboPLUS HDC Version 1.0.13
Tuesday, September 7, 2021 8:00:00 AM EDT
- Various Bug Fixes
- Fixes Battery Level Indicator
StroboPLUS HDC Version 1.0.12
Saturday, June 19, 2021 4:53:00 PM EDT
- First Official Production Release
StroboPLUS HDC Version 1.0.11
Saturday, June 12, 2021 5:53:00 PM EDT
StroboPLUS HDC Version 1.0.10
Monday, June 7, 2021 7:17:00 AM EDT