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Thank you! Now its clear, it is the common ground missing on my display. Doing like the attached circuit to me work. Please tell me if i do made things wrong. I've also put the original design reference, if it is not a problem for @MarioMaster.

@ARG tryed your solution, no luck, i've always my two problems. @Kalmito tryed, no luck. my zero pot just does not work. @Kalmito: 1) does your zero pot make the display goes to 0.0000? 2) looking at the TEC from the above, like the picture i previously sent, is the right wire of your TEC...

hello, i'm finally building this tool. i use the same display of Kalmito (0V t0 33V 5 digits) tested with my multimer, works good, event with milliV. from 0 to 4.5V, it has 4 digits after the decimal point, if voltage is greater than 4.5V is has 3 digits after the decimal point. two input, one...

thank you!

what do you use to fix (paste / glue) the peltier to the heat sink?

after 3 weeks it arrives to mee too. i've not mounted it, i'm waiting for the voltage meter now :)

hello all, i'm building this LPM too, but i'm a neebie in laser power metering, so i ask you: 1) could you confirm me that the attached schematics is correct? 5k resistor will be 4k7 1/4w 5% 5k trimmer is not multiturn 10k trimmer is multiturn 2) power supply will be 5v (or other)? 3) also...