Hi, I amCustomer I have more than 44 years of experience owning and operating a very large Lawn Mower and small engine business... specializing in the sales and repair of Lawn Mowers, Chainsaws, Weed Trimmers, Snowthrowers, Lawn Tractors, ZTR'S, Power Blowers, Pumps, Pressure Washers, Portable Generators and just about all other equipment using a Small Engine.
I will be glad to try to help you.
I am sorry that you are having this issue.
I will give you an initial answer and then we may need to discuss this further if the information I gave you does not completely solve your issue. Feel free to contact me here at this post if you need further information. It would also be nice for you to let me know how things worked out.
As far as I can see.. I do not believe that thr meter can be recalibrated .... but that doesn't mean that I am completely right.
I am sending you several links that might be able to help you. The first one is the operatpr's manual. Next are some videos. I have NOT watched these videos so I cannot say they are exactly what you want. But this is the best information that I could find.
Here is the COMPLETE search on Google for information on your meter.
I hope this information helps.
Feel free to contact me here at this post if you would like to discuss this issue further.
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There should be a link at the bottom of the page where you can leave a good 5 star rating. If you are using a cell phone, you may have to click on the FINISH CONVERSATION button first and then the rating buttons should appear. Please do that for me.