Picked this up off Ebay for $25. Came with a type J thermocouple.
Has the battery option. Uses 4 D NICAD's in the black battery holders.
25+ years old and still right on.
Got this primarily to monitor board temps during hot air work. Also, heat sink temps, ect.
I found the operators manual on line but have not been able to find the service manual. If any one has one or a link please let me know.
KT