We''ve been here before:
Recommend torque wrenches from PVR Direct, Sealey, with calibration certificates. Most useful a STW1012, 2-24 Nm, (also AK623, 27.1 -108.5 Nm. for BB etc) Also Sealey S0533 Hex Bit & Holder set. Wrenches were about £25-30. Certificated kit - and they were discounted by more than 50% when I bought them. Best prices around at the time. relatively difficult to find 'light' torque wrenches anyway. The S0533 Hex bit and holder set is really worth having.
(this posted in earlier threads)