Just had a look with my sat finder (cheapish-GT Media V8 Finder 2 (P) I have noted 6 transponders (FTA) which I "test" with the tester, and compare with the box.
11739V Gigablue SNR 64%, AGC 98%, Tester Quality 74% Strength 73%
11914H Gigablue SNR 64%, AGC 97%, Tester Quality 74% Strength 72%
12168V Gigablue SNR 68%, AGC 95%, Tester Quality 74% Strength 72%
12090V Gigablue SNR 64%, AGC 95%, Tester Quality 72% Strength 72%
12110H Gigablue SNR 68%, AGC 99%, Tester Quality 77% Strength 73%
12129V Gigablue SNR 64%, AGC 95%, Tester Quality 74% Strength 72%
I have noted that all my readings with all the satellites (13°, Astra19°, 23.5° and Sly 28°) are all higher on the sat box compared to the tester