Imagination Technologies takes licensing payments when a chipmaker adopts its technology and then royalties when the completed chips are used in their end product, a mobile phone, tablet or whatever. The problem for the market is twofold. One, the shares are on a multiple that, even for the sector, is high, approaching 40 times this year's earnings. The second is the decision to diversify into the making of digital radios. The business is vulnerable to the slowdown in consumer spending. The current multiple would seem to be taking a lot on trust, says the Times.AstraZeneca announced the widely expected sale of its Astra Tech dental implants and medical devices unit yesterday. US group Dentsply triumphed over rival bidders from the medical and private equity world to acquire the business for $1.8bn. In the past, we've held back from buying as AstraZeneca appeared to offer little in the way of exciting growth prospects. This deal - though good for investors, who should see nice returns - does not change that view. Hold, says the Independent.Sepura makes radios for the so-called "first response" services such as the police, medics and firemen. The Cambridge-based firm revealed it had been a tough year, with revenues down 10% to £70.4m. Management remains confident about long-term prospects, and it is investing for growth, which is good - but it's too early to buy. Hold, says the Independent.Philip Clarke, the newish chief executive of Tesco, has admitted that the retailer's much-vaunted march into Central and Eastern Europe has met with a few challenges. But this week Tesco has taken a gaggle of analysts around its operations in Poland, the Czech Republic and Slovakia. If the analysts believe that Mr Clarke can fulfill their expectations, their conclusions at the end of the trip could give the share price a fillip, says the Times.The process of extracting oil and natural gas from shale is a controversial one because of claimed environmental damage. This requires the use of advanced pumps and other equipment, and the world leader in providing these is Weir Group through its Texas-based SPM business, which has about 50 to 60 per cent of the pumps market and 30 per cent of the total equipment needed. The shares are on a hefty 15-plus times future earnings, but the SPM story has further to go, says the Times.Is yesterday's profit warning shattering for Superglass? On the face of it, things do not look good. Sales via the Government-sponsored Carbon Emissions Reduction Target (CERT) scheme - which demands that utilities subsidise insulation using materials that Superglass makes - have been poor. There are grounds for seeing Superglass as a recovery play, not least because of the political drive to cut emissions. Speculative buy, says the Independent.Please note: Digital Look provides a round-up of news, tips and information that is impacting share prices and the market. Digital Look cannot take any responsibility for information provided by third parties. This is for your general information only as not intended to be relied upon by users in making an investment decision or any other decision. Please obtain a copy of the relevant publication and carry out your own research before considering acting on any of this information.