Ok so I understand the rules in the DMG for item creation are guidelines only and that you should always compare anything new to a similar item, so here is my question.
True Casting, standard action to cast gain +10 to overcome spell resistance on next spell. spell level 1, minimum caster level 1.
True strike standard action to cast, gain +20 on next attack.
Use activated or continuous: 1x1x2000=2000gp (level of spellXcaster levelX2000) this is definitely too inexpensive for true strike and the item should be unavailable as there is no comparable item granting a continuous +20 to attack, in addition a "similar" item to true casting would be Third Eye Penetrate, costing 8000 and providing only a continuous +2 to caster level checks to overcome spell resistance (so obviously 2000 gp is too low here) so let's move on shall we?
Charges per day lets say 3 charges per day: Base price (2000)/(5/3)=1200 (roughly)
Item with 50 charges: Base price(2000)/2=1000 (slightly more expensive than a "comparable" regular lvl one wand at 750).
While a continuous option is not feasible (at least not at the low price of 2000) would a charged or X times per day item be feasible or would this break the game/cost far too little?