Peter_j2, who quoted you $300.00 to repair your Minolta Color Meter IIIF? Like others, I have a Minolta Color Meter IIIF? in need of calibration. Years ago think I sent it to Precision Camera, along with a Minolta Color Meter II. They were able to repair the Minolta Color Meter II, because they still had the calibration equipment. Could not repair the Minolta Color Meter IIIF, because the calibration equipment had been lost or destroyed when company was sold. They did however tell me that the Minolta Color Meter IIIF could be set to match my Minolta Color Meter II, by using one of the nine (9) memory channels. I do not remember how to do it, as I just relied on my Minolta Color Meter II. Then later paid $60.00 for a 2nd Minolta Color Meter II. I later bought a Gossen 3F color meter. Which was working fine until two weeks ago. All of my meters had not been used for the past 2 plus years, as I had knee replacement, and CO-VID put a stop to most of my work. All meters were stored W/O batteries. Yet, when I went to use the Gossen 3F color meter it was way off, and I do mean WAY OFF! The two Minolta Color Meter II meters are within 50K degrees of each other. I was taught that if you are within 200K degrees. You were good to go. Like others, I noticed that the Kenko color meter was very much like my Minolta Color Meter IIIF. Yet, I was told it was not and the Minolta Color Meter III could not be repaired. As for the Gossen 3F. Think I will try using the color filter method that john_ daniels2 used. Also will try and remember how to use the memory channels on the Minolta Color Meter IIIF to match the readings of the Minolta Color Meter II meters. I thought about buying a new color meter because newer color meters are needed to read the color output of the LED lights. I could not justify the high cost. So, I tried using the Minolta Color Meter II and adjusting in post production. I am not very good in using post-production software like Adobe Premiere, but think I found something that works for me. I tried to stick to one maker for all of my LED lights, just as I did when I used fluorescent lighting. I was able to my Minolta Color Meter II when I metered fluorescent lighting. figured I could get close with a bit of luck. When color metering LED lights. What worked for me, was to cut by half the CC+ (Magenta) readings of the Minolta Color Meter II. For me it was better for my subjects to be a little magenta, than a little green. I was using what is now considered very old ALZO 3000 LED lights. Some had a CRI of 86, others had a CRI 90 rating. I also used a very old version of Adobe Premiere CS6 There was no way in Heaven, Earth of Hell. I was going to pay a subscription fee! To show you how bad subscription fees are. I am now using an excellent 24" iMac. Bought it from a buddy. He sold it to me, because his Adobe subscription software updates, no longer worked on a late 2012 iMac. Mind you, this is a excellent iMac with 24GB of RAM. All I did was to upgrade to a 1TB SSD drive. When I think of how much of a photographer's digital equipment is no longer repairable, it boggles the mind. My large format digital printers are dead in the water. Because it cost as much or more to repair them, as to buy a new one. My digital still cameras can no longer be repaired five to ten years after newly purchased. I am still using film cameras made in the mid 1980's. My digital video cameras are much like the saga of the Minolta Color Meter II & Minolta Color Meter IIIF. I started with the Canon XL2, then moved to the Canon XLH1 The Canon XL2 has an internal battery that the end user can replace. The Canon XLH1 does not allow replacement of the internal battery. It cannot be replaced by anyone! You have to tear the Canon XLH1 to get to the rechargeable internal battery. Almost the same with my Leaf Aptus 22 digital back. After ten years, no one will work on or repair the medium format back. Plus the internal battery is in such a place, that you risk destroying the back if you attempt replacing the battery yourself. It also seems there is no such thing as LED lighting repair. All of my flash heads, for my studio lighting are able to have replacement flash tubes installed. I use Balcar lighting power packs, and it was not until last year. When an independent repair person died, that I could not get older Balcar power packs repaired. He did/could not repair Balcar digital power packs. Because Balcar refused to give anyone the information needed to repair them. The Balcar digital power packs did not work any better, and failed at a higher rate,than the older Balcar power packs better. I have had Apple techs tell me that my G5, iMac, iBook computers could not be upgraded or repair. Only to find information on the Internet, that help me to keep them all working. I use Mamiya 645 AFD medium format cameras. I use both older manual focus and auto-focus lenses with the camera body. I can get the manual focus lenses repair at a decent cost. The auto-focus lens repair is the cost of buying a used one in excellent condition. It was not until five years ago, that LED lights started to match the color fidelity and amount of light output of tungsten or HMI lighting. Now that LED lights are matching output and CRI values. They are missing one major thing. Customer support or product repair. I can e-mail or call any of the makers of my HMI lights or find an independent lighting repair shop for my HMI and tungsten lights. Most Lowel tungsten lights are an easy self repair job. Well, my wife beckons me. got to go.