I'm just testing it at the moment (to see if it works well or not)
I'm just experimenting at the moment
I'm just checking it to see if it works
「今、実験中です」= I'm just testing it at the moment (to see if it works well or not) / I'm just experimenting at the moment / I'm just checking it to see if it works
ボキャブラリー
just = 今~しているだけ
test/experiment/check = 実験する
at the moment = 今(~)中
to see if it works well or not = うまく行くかどうか